Free game graphics and audio resources

• http://kenney.nl/
• http://wiki.unity3d.com/

• HasGraphics – Free Graphics for Indie Game Developers
• Open Game Art – Free, legal art for open source game projects (includes models, sprites, textures, sounds, music).
• SpriteLib GPL – Static and animated sprites that are free for any use.
• Lost Garden free game graphics – Danc’s miraculously flexible game prototyping graphics for small worlds.
• pdsounds – Public domain sounds, a free sound library.
• The Freesound Project – A collaborative database of Creative Commons licensed sounds.
• The Official Blender Model Repository – Free Blender resources.

CommandInvokationFailure: Failed to sign APK package.

1. First, make sure that you have selected "Development Build"
2. If first solution is not working, uninstall all Java related jdk and download and install a new one and give jdk path on unity.

Creating Key Store on Unity

Setting Android on Windows on with Unity 2017.1.1f1

My settings
OS: Windows 10
Unity Version: 2017.1.1f1
JDK Verison: Jdk-9
Android Studio: Version 2.3.3
Androi SDK:

1. Set Java Path for computer. (Computer->Properties->Advanced system settings->Environment Variables)

* System Variable
Variable Name : PATH
Variable Value : C:\Program Files\Java\jdk-9\bin

EXTRA:
But the best practice is to set JAVA_HOME and PATH as follow.

* User Variable
Variable Name : JAVA_HOME
Variable Value : C:\Program Files\Java\jdk-9

* System Variable
Variable Name : PATH
Variable Value : %JAVA_HOME%\bin

Possible Error Solution:

2. Download Android Stuio or SDK from https://developer.android.com/studio/index.html

3. Install it, make sure that you select tools and SDK (if you are installing Androi Studio.)

4. Then launch Android Studio and finish installation by downloading sdk.

5. From Android Studio, Install services and NDK. And make SDK udates.

6. Your sdk path : C:\Users\UserName\AppData\Local\Android\sdk

5. irst I tried installing Android SDK and an older Version of JDK into folders with only three letters in the folder name directly on the desktop. But this was not the solution.

Then I fixed it by downgrading the android sdk tool version. Obviously the most current version (SDK Tools, Revision 25.3.0 (March 2017)) causes the trouble.

This is how you do it:

    Go to your Android SDK Folder. (If you did not change the path during Android Studio installation you will find the SDK folder here: C:\Users\YourUsername\AppData\Local\Android\sdk )

    Rename the old Android sdk "Tool" folder : [Your Android SDK root]/tools -> toolsXXXX

    Download Android SDK Tools, Revision 25.2.5 (January 2017): http://dl-ssl.google.com/android/repository/tools_r25.2.5-windows.zip

    Extract that to Android SDK root folder.

    In Unity go to Edit>Preferences>External Tools and check again, that the path for Android SDK points to the correct folder. (The correct path is the SDK root folder, not the tools folder which is inside the root folder!)

    Build your project.

Java Path Environmental Settings in Windows 10

Just set the path variable to JDK bin in environment variables.

Variable Name : PATH 
Variable Value : C:\Program Files\Java\jdk1.8.0_31\bin

But the best practice is to set JAVA_HOME and PATH as follow.

Variable Name : JAVA_HOME
Variable Value : C:\Program Files\Java\jdk1.8.0_31

Variable Name : PATH 
Variable Value : %JAVA_HOME%\bin

Best-websites-a-programmer-should-visit

Some useful websites for programmers.

When learning CS there are some useful sites you must know to get always informed in order to do your technologies eve and learn new things. Here is a non exhaustive list of some sites you should visit, this list will get updated as soon as I can get another link, but you can also contribute by adding those you know 😉

Index

• When you get stuck
• News
• Magazines
• Coding practice for beginners
• For those who want to start a small project but can't find the ideas
• General Coding advice
• Coding Style
• General Tools
• Interview Preparation
• Documentaries
• MOOCs for learning something new
• Sites related to your preferred programming language (For me Java)
• Learn AI
• Seminar , research writing , talks etc
• Everything in one place
• YouTube Channels
• Good Articles
• Bash and Shell scripting
• Podcasts
• Building a Simple Compiler/Interpreter
• Watch others code
• Tutorials
• What should a programmer know
• Competitive programming
• Computer Books
• Video Tutorials
• Online Compiler and Sharing Code snippets
• Blogs of Developers
• For improving your English
• When you get bored from CS related stuff
• Open Source Websites

When you get stuck

• Codementor : A mentorship community to learn from fellow developers via live 1:1 help and more.
• devRant : Community where you can rant and release your stress
• Learn Anything : Community curated knowledge graph of best paths for learning anything
• Quora : A place to share knowledge and better understand the world
• Stack Overflow : subscribe to their weekly newsletter and any other topic which you find interesting

News

• ACM TechNews : TechNews
• Stratechery : Stratechery by Ben Thompson
• AlternativeTo : Crowdsourced software recommendations
• Ars Technica : posts unique quality articles
• Better Dev Links : Weekly links to help you become a better developer
• DevOpsLinks : An online community of thousands of developers and IT experts interested in DevOps
• GSMArena.com : news related to latest mobile phones and android.
• Hacker News Digest : curated automatically, delivered as frequently as you want
• Hacker News : news aggregator for programmers where civility is king, try a newsletter to get top news to your inbox:
• Hacker Newsletter : curated by hand, delivered weekly
• High Scalability : Success stories of various companies on their apps, infra scaling.
• Lobsters : Lobsters is a technology-focused community centered around link aggregation and discussion.
• product hunt : Discover your next favorite thing
• Recode : Tech news that focuses on the business of Silicon Valley
• Reddit.com/r/programming : Subreddit with aggregated tech news and articles
• Slashdot : News, Social news (Originally "News for Nerds. Stuff that Matters")
• Stack Share : Technical stack sharing site for various companies
• TechCrunch : dedicated to obsessively profiling startups, reviewing new Internet products, and breaking tech news
• The Verge : More product oriented tech news
• XDA : Android Developers News

Magazines

• MIT Technology Review : MIT's tech review magazine.
• Nautilus : NewYorker for tech.
• LWN : Weekly news coverage of opensource technologies, programming, etc. ( Originally Linux Weekly News).

Coding practice for beginners

• Cave of programming : Learn to program, Upgrade your skills.
• Codeacademy : Learn to code interactively, for free.
• CodeAbbey - a place where everyone can master programming : Best place to begin with problems that start at the easiest and gradually increase difficulty with each problem.
• Exercism.io : download and solve practice problems in over 30 different languages, and share your solution with others.
• freeCodeCamp : Learn to code and build projects for nonprofits. Build your full stack web development portfolio today
• karan/Projects-Solutions : Solutions to most of the problems in the link above
• Lod - Cloud : The Linking Open Data cloud diagram
• Programming by Doing : very good site for those who want to start with absolute basics
• Reddit.com/r/dailyprogrammer : interesting programming challenges where you can learn from looking at other's code , even if you are not able to solve code you can look at how others solved.
• People Can Program : The most user-friendly code learning application on the internet.
• Programming Tasks : large collection of small programs
• Vim adventures : Learn VIM by playing
• Pramp : It's your turn to be the interviewer. when done, click on the swap roles button on the left
• Paqmind : Guides and challenges to learn programming

For those who want to start a small project but can't find the ideas

• freeCodeCamp | React project ideas : 27 fun app ideas you can build while learning React.
• martyr2s-mega-project-ideas-list : contains about 125 project ideas from beginner to intermediate level.
• karan/Projects : a large collection of small projects for beginners with
• Wrong "big projects" for beginners : How to choose where to start
• vicky002/1000-Projects : Mega List of practical projects that one can solve in any programming language!

General Coding advice

• 10-ways-to-be-a-better-developer : Ways to become a better dev!
• Code Review Best Practices : Kevin London's blog
• Dieter Rams : 10 Principles of Good Product Design : Stephen Haunts { Coding in the Trenches }
• Design Patterns : Design Patterns explained in detail with examples.
• How to become a programmer, or the art of Googling well : How to become a programmer, or the art of Googling well
• JS Project Guidelines : A set of best practices for JavaScript projects.
• Lessons From A Lifetime Of Being A Programmer : The Codist Header Lessons From A Lifetime Of Being A Programmer
• Programming Principles : Categorized overview of Programming Principles & Patterns
• Software design pattern : The entire collection of Design Patterns.
• Things I Wish Someone Had Told Me When I Was Learning How to Code — Free Code Camp : What I’ve learned from teaching others
• What every computer science major should know : The Principles of Good Programming
• Working as a Software Developer : Henrik Warne's blog

Coding Style

• Airbnb JS Style Guide : A mostly reasonable approach to JavaScript
• Airbnb Ruby Style Guide : A ruby style guide by Airbnb
• Ruby coding style guide : A community-driven Ruby coding style guide
• Angular 1 Style Guide : Officially endorsed style guide by John Pappa
• CS 106B Coding Style Guide : must see for those who create spaghetti
• Debugging Faqs : Check out how to debug your program
• Directory of CS Courses (many with online lectures) : Another online CS courses
• Directory of Online CS Courses : Free online CS courses
• Good C programming habits. • /r/C_Programming : C programming habits to adopt
• Google C++ Style Guide
• How to Report Bugs Effectively : Want to report a bug but you don't how? Check out this post
• What are some bad coding habits you would recommend a beginner avoid getting into? : Bad habits to avoid when you get start
• PEP8 - Style Guide for Python Code : Style Guide for Python Code
• Google Python Style Guide : Google Python Style Guide
• Aurelia Style Guide : An Aurelia style guide by Behzad Abbasi(Behzad888)

General Tools

• CodePad : Quickly Conduct Coding Interviews and Phone Screen Interviews.
• CodePen : Front End Developer Playground & Code Editor in the Browser
• Devicons : Cheatsheet for devs icons
• regex101 : Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript
• regexr : Another online tool to learn, build & test Regular Expressions
• Wit AI : Natural Language for Developers

Bash and Shell scripting

• Advanced Bash-Scripting Guide : An in-depth exploration of the art of shell scripting
• Bash Guide for Beginners : Bash Guide for Beginners Machtelt Garrels
• Bash Programming : by Mike G mikkey at dynamo.com.ar
• Bash Reference Manual : Bash Reference Manual
• BashGuide : BashGuide - Greg's Wiki
• Conquering the Command Line : Unix and Linux Commands for Developers

Interview Preparation

• /r/cscareerquestions : Here's a pretty big list of programming interview questions I compiled while studying for big 4 interviews. I think you guys will find it useful!
• 10 Frequently asked SQL Query Interview Questions
• A Collection of Quant Riddles With Answers
• Algorithm design canvas)
• Aptitude Questions and Answers : Quant and aptitude preparation
• A site for technical interview questions, brain teasers, puzzles, quizzles : whatever the heck those are) and other things that make you think!
• BeehYve : Student crowdsourced resources for any topic
• Big collection of interview preparation links • /r/cscareerquestions
• Big-O Algorithm Complexity Cheat Sheet
• BIG O Misconceptions
• Bitwise tricks
• checkcheckzz/system-design-interview
• ChiperSoft/InterviewThis : questions to ask during on a interview to know more about the company.
• Code Project : For those who code!
• Core Java Interview questions - Interview question on each topic
• C PUZZLES, Some interesting C problems
• CS9: Problem-Solving for the CS Technical Interview
• Delightful Puzzles
• Determining the big-O runtimes of these different loops? : really good stackoverflow question that covers basics of calculating runtime complexity.
• five-essential-phone-screen-questions - steveyegge2
• Freshers Interviews
• GeeksforGeeks | A computer science portal for geeks : also subscribe to their feeds to get links to their new articles.
• Get Ready to Learn SQL: 8. Database Normalization Explained in Simple English - Essential SQL
• github.com/odino/interviews : list of important questions for interview
• Give your résumé a face lift
• Guide to Tech Interviews
• Here's How to Prepare for Tech Interviews • /r/cscareerquestions
• How to Ace an Algorithms Interview
• How to Answer "Tell Me a Little About Yourself" | The Art of Manliness
• How to Answer the Toughest 40 Job Interview Questions | ICS Job Portal
• How to Break Into the Tech Industry - a Guide to Job Hunting and Tech Interviews
• How to interview
• How to prepare for an interview - 1
• IIT Delhi Placement Experience
• samwincott/Internship-Guide : An aggregrate of links related to internships.
• Interviewing At Jane Street : Interviewing At Jane Street
• Interview Archives - Java Honk
• Job Interview: How to Ace a Job Interview | The Art of Manliness
• Job interviews News, Videos, Reviews and Gossip - Lifehacker
• Job Interview Questions and Best Answers
• kimberli/interviews : study sheet for Interview
• Mission-peace/interview problems : A large collection of coding interview problems
• Pramp | A free on demand interview practice platform for Software Engineers : Practice coding interviews with real peers
• Problems | LeetCode OJ : Coding practice for interviews
• Programmer And Software Interview Questions Answers
• Reddit.com/user/ashish2199/m/puzzles : Logic Puzzles
• SQL interview questions : great SQL test
• SQL Joins explained using venn diagram
• svozniuk/java-interviews : Java interview questions
• The 25 most difficult HR questions
• Top 10 Algorithms for Coding Interview : Algorithms for Coding Interview
• Unix / Linux Cheat Sheet
• Unsolicited_advice_for_job_seekers_and_employers
• Visualising Data Structures and Algorithms through Animation
• We Help Coders Get Hired : website offering courses on system design, interview strategies, soft skills etc
• what_are_your_goto_questions_for_the_do_you_have?
• Why You Make Less Money • /r/cscareerquestions
• wu :: riddles(hard) : logic puzzles and riddles

Documentaries

• Ask Me Anything : Gayle Laakmann McDowell (author of Cracking the Coding Interview)
• Breaking the Code : Biography of Alan Turing
• Cracking The Code Interview : Cracking the Code Interview
• Cracking the Coding Interview : Cracking the Coding Interview, Fullstack Speaker Series
• Download: The True Story of the Internet : Play-list of discovery channel documentary on browser wars, dot com bubble and more.
• Harvard CS50 - Asymptotic Notation (video) : Asymptotic Notation explained by Harvard
• How does CPU execute program (video) : Take a look at how a CPU executes programs
• Machine Code Instructions (video) : Code instructions
• Machine that Changed the World - a very good documentary about history of computers
  • Part 1 is unavailable for free streaming due to widespread copyright claims.
  • Part 2: Inventing the Future
  • Part 3: The Paperback Computer
  • Part 4: The Thinking Machine
  • Part 5: The World at Your Fingertips
• Mechanical Computer (All Parts) : a very good video from 1950s explaining how mechanical computers used to work without all the modern day electronics.
• Project Code Rush : The Beginnings of Netscape / Mozilla Documentary
• Teach Yourself Computer Science : Teach Yourself Computer Science
• The Code : Story of Linux documentary
• Triumph of the Nerds : Play-list

MOOCs for learning something new

• Class Central : a directory of 100,000+ student reviews of thousands of MOOCs.
• Computer Science Resources : list of MOOCs for autodidacts
• Coursera.org : Take the world's best courses, online.
• CS50 : A set of goods tutorials from cs50
• edX : Free Online Courses, Advance Your Career, Improve Your Life.
• Kadenze | Creative Programming : Programming courses focused on art and creativity
• MIT OCW Electrical Engineering and Computer Science
• MOOC.fi : Free online courses from the University of Helsinki
• NPTEL : Free online courses by IIT with certificates
• NPTEL Vidoes COMP_SCI_ENGG : National Programme on Technology Enhanced Learning
• prakhar1989/awesome-CS-courses : List containing large amount of CS courses

Sites related to your preferred programming language (For me Java)

• Best books for learning java must read : Get basics of Java
• Bjarne Stroustrup's C++ Style and Technique FAQ : The C++ FAQ
• Bjarne Stroustrup's FAQ : The C++ FAQ
• C++11 - the new ISO C++ standard : The C++11 FAQ
• Compilers (video) : A set of videos on how te GC works
• Deep Dive Java : Garbage Collection is Good!
• Free Online Chapters of Inside the Java Virtual Machine by Bill Venners : Java Corner
• How Garbage Collection Works : Java memory management
• Implementation of Algorithms and Data Structures, Interview Questions and Answers
• IntelliJ Keyboard Shortcuts : Keyboard shortcuts to enhance your productivity when working in IntelliJ.
• Java Corner at Artima.com : Java Corner at Artima.com
• Java Lecture Notes : Java Student's Resource
• Java Off Heap : Java Off the Heap house
• Java Revisited : good for learning about Java Language and interview preparation.
• Java-source : Java source
• Java Visualizer : helps visualize references, values of variables ect
• JournalDev - Java, Java EE, Android, Web Development Tutorials : Java, Java EE, Android, Web Development Tutorials
• Learning Java : a free online textbook for learning Java
• Netbeans Keyboard Shortcuts : Keyboard shortcuts to enhance your productivity when working in Netbeans.
• Search Open Source Java API : view source of java library and learn how things are implemented.
• The C++ Programming Language : The C++ Programming Language.
• The Java Memory Model: The Java Memory Model
• The Java™ Tutorials : The best tutorials for Java.
• Understanding JVM Internals : Understanding JVM Internals
• what-is-garbage-collection : Demystify the garbage collection
• JavaWorld : Welcome to Javaworld
• XyzWs Java FAQs : large collection of java interview questions

Learn AI

• fast.ai : Free practical deep learning course for coders without grad-level maths!
• grakn.ai : The Database for AI
• Robots that learn : Robots that Learn
• Unsupervised Sentiment Neuron : Unsupervised Sentiment Neuron
• What's the difference between AI- DP and ML? : Difference artificial intelligence, machine-learning, deep-learning-ai
• TensorFlow : An open-source software library for Machine Intelligence
• Scikit-learn : A Python module for machine learning build on top of SciPy
• DeepLearning.ai : Deep Learning course by Andrew Ng, Founder of coursera

Seminar , research writing , talks etc

• Advice on Research and Writing : A collection of advice about how to do research and how to communicate effectively (primarily for computer scientists).
• PHD MS Articles : articles and views
• Practical Tips for Talking at Usergroups and Conferences and Giving presentation on software project to non-programmers : Practical Tips for Talking at Usergroups and Conferences
• Seminar and reports : Everyone must read this tiny book before writing the seminar report
• Latex reference : Arbitrary reference
• Begin Latex in minutes : Brief Intro to LaTeX for beginners that helps you use LaTeX with ease
• Lshort : The Not So Short Introduction to LATEX2ε

Everything in one place

• reddit.com/user/ashish2199/m/cs_student_subs : a multisubreddit of all subreddits of topics related to computer science and programming.
• Websites a programmer should isit : Response on Quora by ashish2199

YouTube Channels

• C++Now (BoostCon) : C++Now (previously BoostCon) conference
• code::dive conference : code::dive conference organized by NOKIA Wrocław Technology Center
• Coding Blocks : Tutorials, how to's, tips and tricks
• Computerphile : Must watch for every CS student
• ComputerHistory : for those who like to know how we reached where we are.
• CppCon : C++ Conference
• Facebook Developers
• Fun Fun Function : A weekly series from Mattias Petter Johansson on an assortment of programming topics, including some not directly related to coding.
• Google Developers
• GoogleTechTalks : videos on trending topics and cool stuff happening in the tech industry.
• Gynvael Coldwin : Awesome reverse engineering and hacking(CTF) videocasts. Every wednesday are new live streams.
• HowToBecomeTV : contains good interviews of developers and people related to tech industry.
• Java : talks related to java
• JavaOne : Java Conference
• Meeting C++ YT Kanalseite : Talks on C++
• Netflix UI Engineering : great videos to watch for web developers, mobile developers and those interested in some of Netflix's tech stack
• O'Reilly : interviews and talks of world's best technical writers.
• Placement Grid : Interview and campus placement experience
• Scott Meyers: Past Talks
• Siraj Raval : Artificial Intelligence and deep learning tutorials videos
• ThinMatrix : blogs and tutorials developer making a 3d game in Java using opengl
• thoughtbot : talks on various topics
• yegor256

Good Articles

• 40 Keys Computer Science Concepts Explained In Layman’s Terms
• A Gentle Introduction To Graph Theory
• A programmer friendly language that compiles to Lua.
• A Software Developer’s Reading List : Some good books and links in there.
• Code a TCP/IP stack : Let's code a TCP/IP stack, 5: TCP Retransmission
• Codewords.recurse : The language of choice
• Data structure and Algoritms : List of some algoritms and datastructure with their solutions.
• Data Structure Map
• Dive into the byte code
• Expectations of a Junior Developer
• Linux Inside
• List of algorithms
• The Key To Accelerating Your Coding Skills
• Unicode
• We are reinventing the retail industry through innovative technology
• What every programmer absolutely, positively needs to know about encodings and character sets to work with text
• What every programmer should know about memory, Part 1
• Why fast pages are important : Why App Speed Matters, Revenue

Podcasts

• Coding Blocks : A podcast covering topics such as best programming practices, design patterns, coding for performance, object oriented coding, database design and implementation, tips, tricks and a whole lot of other things.
• Developer On Fire : A podcast that shares the humanity of developers and tells stories of some of the amazing people in software, hosted by Dave Rael.
• Developer Tea : A podcast for developers designed to fit inside your tea break.
• Front End Happy Hour : A podcast featuring a panel of Software Engineers from Netflix, Evernote, Atlassian & LinkedIn talking over drinks about all things Front End development.
• Full Stack Radio : Everything from product design and user experience to unit testing and system administration.
• Groovy Podcast : A podcast dedicated to the Groovy programming language and its ecosystem.
• IPhreaks : A weekly group discussion about iOS development and related technology by development veterans. We discuss Apple, tools, practices, and code.
• JavaScript Jabber : A weekly discussion about JavaScript, front-end development, community, careers, and frameworks.
• MS Dev Show : Jason Young and Carl Schweitzer talk about the latest in developer news covering topics such as the Azure cloud, Windows, Windows Phone, Visual Studio, and cross-platform development using the Microsoft platform.
• React Native Radio : A weekly discussion of the tools, techniques, and technologies used to build mobile applications with JavaScript and React.
• Software Engineering Daily : A daily technical interview about software topics.
• Software Engineering Radio : A podcast targeted at the professional software developer. The goal is to be a lasting educational resource, not a newscast.
• Syntax : A Tasty Treats Podcast for Web Developers by Wes Bos & Scott Tolinski.
• The Bike Shed : Guests discuss their development experience and challenges with Ruby, Rails, JavaScript, and others.
• The Changelog : A weekly conversation that gets to the heart of open source technologies and the people who create them.
• The Cynical Developer : A podcast that aims to help you to improve your development knowledge and career, through explaining the latest and greatest in development technology and providing you with what you need to succeed as a developer. Covering Desktop, web and mobile development, mainly around the .Net Stack but often looking into other software and frameworks.

Building a Simple Compiler/Interpreter

• ⛄️ Possibly the smallest compiler ever : This is an ultra-simplified example of all the major pieces of a modern compiler written in easy to read JavaScript.
• Awesome Compilers : Curated list of awesome resources on Compilers, Interpreters and Runtimes.
• Growing a compiler : Learn how to grow a compiler
• Let’s Build A Simple Interpreter. Part 1. : Try to demystify compilers by building one
• Resources for Amateur Compiler Writers : Resources for Amateur Compiler Writers
• Structure and Interpretation of Computer Programs : Structure and Interpretation of Computer Programs
• Writing My First Compiler : Write out your first compiler
• An Intro to Compilers : How to Speak to Computers, Pre-Siri
• Write your own compiler : How to write your own compiler

Tutorials

• A Hacker's Guide to Git : for those wanting to learn git with a solid foundation
• Best Of - Gustavo Duarte : contains articles on various topics
• CMSI 281: Data Structures : light weight introduction to DS
• Collecting all the cheat sheets : cheat sheets for lots of programming languages
• C Programming
• C programming language Frequently Asked Questions
• Data Structures and Algorithms by John Morris : another good source with code and its analysis
• Deep C : very good presentation on C language
• Design Patterns: Elements of Reusable Object-Oriented Software : aka the "Gang Of Four" book, or GOF
• Dynamic programming - PrismoSkills : very good resource if want to learn how to solve DP problems.
• Git from the inside out
• Head First Design Patterns
• How to Program in C++ : Good resource for revising C++ topics and STL
• http://www.mysqltutorial.org/
• indradhanush tutotials : Writing a Unix Shell
• Introduction to C Programming
• Learn UNIX in 10 minutes
• Learning the shell.
• Linux Journey : good site for learning linux
• Linux Tutorial : good resource for learning Linux
• More about Github-flavored markdown
• MySQL Essentials
• Open Data Structures : Excellent resource for learning about DS and algos, provides code in various languages C++, Java and pseudocode.
• OS Course Notes : Chapter wise course notes according to Galvin's book
• Programming, Web Development, and DevOps news, tutorials and tools for beginners to experts
• SQL (Structured Query Language) in one page : SQL.SU : a very good SQL cheat sheet
• Subtle | Poor Man's CI : Learn how continuous integration platforms work under the hood, by building one of your own on top of git with Node.js
• TCP/IP Illustrated Series
• The Bash Guide : very good guide for learning the Bash Shell
• The Descent to C : for those moving to C from some higher programming language like java or python.
• The Linux Command Line: A Complete Introduction
• The Unix Programming Environment
• TopCoder Tutorials
• Tutorialspoint : Text and Video Tutorials for UPSC, IAS, PCS, Civil Services, Banking, Aptitude, Questions, Answers, Explanation, Interview, Entrance, Exams, Solutions
• UNIX and Linux System Administration Handbook, 4th Edition
• VimTutor+ : Learn VIM from the browser.
• W3Schools Online Web Tutorials
• Unix Shell : Unix shell scripting with ksh/bash
• Snap SVG : The JavaScript SVG library for the modern web
• vim.rtorr : Vim Cheat Sheet
• Open Vim : Interactive Vim tutorials
• Algorithm Using Dynamic Programming and A : Designing a Tree Diff Algorithm Using Dynamic Programming and A*

Watch others code

• LiveEdu.tv : screencast of people building application, websites, games, etc.
• Twitch.tv : The programming community of twitch.

What should a programmer know

• GitHub.com Build software better, together : Place to showcase your project and collaborate with others. (Must know Git in order to use it effectively)
• Gitlab offers free unlimited (private) repositories and unlimited collaborators
• Programmer Competency Matrix : article for knowing what our level as a programmer is.

Competitive programming

• Archived Problems - Project Euler : Problems Archives
• Art of Problem Solving : Is math class too easy for you? You've come to the right place!
• CodeChef : The only programming contests Web 2.0 platform
• Codefights : Test your coding skills
• Codeforces : Programming Competition,Programming Contest,Online Computer Programming
• Codewars : Rank up by completing code kata
• Codility : Verify and improve coding skills
• Codingame : Learn coding through games and challenges!
• Google Code Jam Practice and : past contest problems for practice
• HackerEarth - Programming challenges and Developer jobs
• HackerRank : Practice coding. Compete. Find jobs.
• PKU ACM ICPC Practice problems : Judge online for ACMACPC
• Sphere Online Judge (SPOJ) : Become a true programming master Learn how to code and build efficient algorithms
• Topcoder : Deliver Faster through Crowdsourcing
• UVa Online Judge : hundreds of problems supporting multiple languages.
• WakaTime : leaderboards of coding metrics collected via editor plugins

Computer Books

• Become a Programmer, Motherfucker (list of books) : Exhaustive list of books from Zed A. Shaw.
• Best books for GATE CSE
• cses.fi/book.html
• github.com/vhf/free-programming-books : More than 500 free ebooks on almost any language you can think of
• GitBook : GitBook helps your team write, collaborate and publish content online.
• Data Science course : Python Data Science Handbook

Video Tutorials

• codedamn : front end web dev tutorials
• Code School : A PluralSight Company and an Interactive learning destination for aspiring and experienced Developers
• CodingMadeEasy : C++ tutorials
• CS1: Higher Computing - Richard Buckland UNSW : a very good introductory CS course
• Derek Banas : good quality tutorials
• Design and Analysis of Algorithms
• DevTips : web dev tutorials
• Kathryn Hodge : Has good videos for beginners
• mycodeschool : Data structures and algorithms tutorials
• Pluralsight : Learn Software Development, DevOps and Data Science through multiple short courses
• thenewboston : good but with too much talk as compared to actual content
• Tushar Roy : Algorithm and Data structure tutorial by an Indian Youtuber.
• Vim Tutorial Videos - Flarfnoogins : good video tutorial for learning vim
• XDA-University - Helping You Learn Android Development
• Khan Academy : learn about computer science for free
• Functional programming : John Carmack on Functional Programming (2013)
• Video about vims : A serie of tutorials about Vim

Online Compiler and Sharing Code snippets

• CodePad : Code editor to try, test and run 25+ languages
• Codesandbox.io : CodeSandbox makes it easier to create, share and reuse React projects with others.
• Godbolt.org : Excellent tool for exploring the assembly output of different compilers with and without optimization.
• Ideone.com : online compiler and debugging tool for more than 60 programming languages
• JSFiddle : Test your JavaScript, CSS, HTML or CoffeeScript with online code editor
• Pastebin.com
• C9.io : Your development environment, in the cloud
• Github Gist : Instantly share code, notes, and snippets.

Blogs of Developers

• Algo-Geeks : Programming Puzzles, Math Tricks, Algorithms etc
• Antirez - Redis Creator's blog : the blog of Antirez
• Antonio081014's Algorithms Codes : The world is under the RULE.
• Archives — Ask a Manager : HR related stuff
• Armin Ronacher's Thoughts and Writings : blog on Python and open source
• blog.might.net : the blog of might dot net
• Brendon Gregg - Linux Kernel Dev : the blog of Brendon D. Gregg
• Clean Coder Blog : blog of author of book "Clean Code"
• CodeAhoy : Blog on software and human factors. 100% Tested on Humans.
• CoderGears Blog Insights from : the CoderGears Team
• Coding Geek - A blog about IT, programming and Java : A blog about IT, programming and Java
• Coding Horror : one the best coding blog
• CSE Blog : quant, math, computer science puzzles
• Daedtech.com : Stories about software
• Dan Dreams of Coding
• Daniel Lemire's Blog : Daniel Lemire's blog
• Eli Bendersky : everything from Python to LLVM
• Geek Land : My precious collectibles
• HackerEarth Blog : The hackerearth blog
• IT Enthusiast : IT Enthusiast
• Joel on Software : The blog of the CEO of StackOverflow
• Late Developer : Random thoughts of an old C++ guy
• 1ucasvb's laboriginal math and physics visualization : Lucas Vieira Barbosa's lab original math and physics visualization
• Math ∩ Programming : Math ∩ Programming
• My Tech Interviews : PREPARE FOR A TECHNICAL INTERVIEW
• Paul Graham Essays : Paul Grahan Essays
• Programming Blog : programming blog of Yegor Bugayenko
• Programming in the 21st Century : programming in the twenty-first century
• rudhakar Rayavaram : Sudhakar Rayavaram Blog's
• Runhe Tian Coding Practice : Technical interview questions from Apple, Google, Facebook, Amazon and Microsoft
• Small Programming Challenges and Puzzles : Project Nayuki
• Stephen Haunts { Coding in the Trenches } : Software Development, Architecture and Technical Leadership for the Enterprise
• stevehanov.ca : I know how to make and sell software online, and I can share my tips with you.
• Takipi Blog : mainly focuses on Java and JVM languages
• WildMl : A blog for machine learning.
• XDA - Android Developer Forum : Android Open Source Developers Forum

For improving your English

• Englishclub.com/learn-english
• Guide to Grammar and Writing : for those who want to improve their english language skills
• Punctuation and Capitalization Rules
• Purdue University Online Writing Lab (OWL)
• Quia - English

When you get bored from CS related stuff

• Barcroft TV : Daily short documentaries about the incredible variety of people that make up the world
• Big Think : Expert driven, actionable, educational content, featuring experts ranging from Bill Clinton to Bill Nye
• ColdFusion : Past, present, and future of technology
• CrashCourse : small courses on various subjects
• Every Frame a Painting : High quality analysis of films and filmmaking
• National Geographic : High volume of high quality content from all over the world
• r/ProgrammerHumor : Subreddit dedicated to exactly what it sounds like
• Reddit the front page of the internet : Where free time goes to die
• Ridddle : A youtube channel about science, mainly, but not only, the universe and space.
• SciShow : Answers to interesting questions that you've always wondered about
• SmarterEveryDay : Lots of amazing scientific information about the world around us, usually captured with a high-speed camera
• TED : Great talks about technology, entertainment, and design
• TestTube News : Interesting information about news from around the world
• Reddit the front page of the internet : Where free time goes to die
• How to live for long time ? : The secret of longevity
• Vsauce : The best youtube channel
• Ox A cuk : How to live a happy life

Open Source Websites

• Open Hatch : OpenHatch is a non-profit dedicated to matching prospective free software contributors with communities, tools, and education.
• Source Forge : SourceForge hosts nearly 280,000 projects (at last count). It serves more than 2 million downloads a day and includes apps and tools in a wide variety of categories.
• Google Code : Google offers free hosting for open source projects using the Subversion or Mercurial version control systems. It offers 2 GB of storage, integrated code review tools, a wiki, and an issue tracker. The Google Code site also provides links to Google's many publicly available APIs and other developer tools.
• Launch Pad : Maintained by Canonical, LaunchPad is particularly targeted at projects that run on Ubuntu. It provides hosting for more than 21,000 projects that use the Bazaar version control system.
• Google Open Source : Google Open Source
• Red Hat Developer : The world's leading provider of open source solutions
• Open Source : Open Source
• Google Summer of Code : Google Summer of Code is a global program focused on bringing more student developers into open source software development. Students work with an open source organization on a 3 month programming project during their break from school.
• Open Source Web Design : Open Source Web Design is a platform for sharing standards-compliant free web design templates. We give web publishers a voice through good design.
• Mozilla Winter of Security : The Winter of Security (MWOS) is a program organized by Mozilla's Security teams to involve students with Security projects. Students who have to perform a semester project as part of their university curriculum can apply to one of the MWOS project.
• Eclipse Lab : Eclipse Labs is a community of open source projects that build technology based on the Eclipse platform. It provides the infrastructure services typically required by open source projects, such as code repositories, bug tracking, project web sites/wiki. Eclipse Labs is hosted by Google Code Project Hosting, so it will be very familiar to developers already using Google Code Project Hosting.
• Bit Bucket : Like GitHub, BitBucket hosts both public and private projects. On this site, open source projects and private projects with fewer than five users are free. It hosts more than 48,000 repositories, many of which are searchable on the site.
• Media Wiki : MediaWiki is a free software open source wiki package written in PHP, originally for use on Wikipedia. It is now also used by several other projects of the non-profit Wikimedia Foundation and by many other wikis, including this website, the home of MediaWiki.

Reference:  https://github.com/sdmg15/Best-websites-a-programmer-should-visit#when-you-get-stuck