The Internet is filled with an ever-expanding number of courses, books and guides for programmers of all skill levels to improve their skills. Unfortunately, these resources are either hard to find or of low quality.
This list aims to be a curated set of high quality educational resources. The availability of free content on the platform is highlighted along with the primary topics covered.
      Free community and toolset to learn to create web pages
      and apps
      (HTML, CSS, JavaScript?)
    
      Free platform for learning to code in web technologies
      (HTML, CSS, JavaScript, jQuery, Python, Ruby, Rails, PHP)
    
      Free interactive 1-hour course to learn the very basics
      of web development
      (HTML, CSS, JavaScript, SQL)
    
      Freemium platform for learning the basics of web
      development
      (HTML, CSS, JavaScript, Node.js, Git, GitHub)
    
      Paid platform for courses how to build websites &
      apps
      (Web Design, Front End Web Development, Rails, iOS, Android, PHP)
    
      Free tutorial for how to do layout with CSS
      (CSS)
    
      Freemium marketplace of courses from third party
      providers. Quality may vary.
      (HTML, CSS, JavaScript, Ruby, Rails, Python, iOS, Android)
    
      Freemium platform for basic web and app develoment
      courses
      (HTML, CSS, JavaScript)
    
      Free beginner to intermediate guides on web
      development
      (HTML, CSS, JavaScript)
    
      Free beginner and intermediate guides on web
      development
      (HTML, CSS, JavaScript)
    
      Mixed directory of courses, videos and other learning
      resources for web development and programming. Quality may vary.
      (HTML, CSS, JavaScript, AngularJS, Rails)
    
      Free Platform for classes on Design, Marketing, Startup
      and Code. Learn the future of the web.
      (RethinkDB, SailsJs, NodeJS, Git, Startup Class, etc)
    
      Free Learn to code and help nonprofits. An open source
      community of people who learn to code and help nonprofits.
      (HTML, CSS, JavaScript, Databases, Git & GitHub, Node.js, React.js,
        D3.js)
    
      Free SQL courses with interactive exercises and
      quizzes
      (SQL, database concepts)
    
      Free Self paced, interactive projects to learn Git and
      GitHub. Created and maintained by GitHub’s training team.
      (Git, GitHub)
    
      Free game that teaches the CSS grid system created by
      [@thomaspark](https://github.com/thomaspark)
      (CSS)
    
      Mixed Self paced, interactive projects to learn
      JavaScript, C, Regular Expressions and computer science in general.
      (JavaScript, Regular Expressions, Bash, computer science, Ansible)
    
      Free Peer reviewed introductory courses for digital
      humanists.
      (Python, R, Unity, QGIS, HTML, Regular Expressions)
    
      Free Foundational coding and data science skills for
      researchers.
      (Python, R, OpenRefine, Unix Shell, Git)
    
      Free teaches programming in Java by creating small
      applications built step by step
      (Java, OOP, Gradle, Maven, Spring Boot)
    
      Free intermediate to advanced courses on how to program
      drawings, animations, games and webpages and more advanced computer
      science topics
      (HTML, CSS, JavaScript, algorithms, cryptography)
    
      Free platform for computer science and web development
      courses
      (HTML, CSS, JavaScript, data science, Python, computer science
        topics)
    
      Paid book and course for beginner through intermediate
      Python programming
      (Python, object-oriented programming, web development)
    
      Free online book covering all stages of creating a Ruby
      on Rails application
      (HTML, CSS, JavaScript, Ruby, Rails)
    
      Freemium platform for video courses on web development
      and intermediate programming
      (HTML, CSS, JavaScript, programming fundamentals, system
        administration, …)
    
      Paid platform for mentored web and mobile development
      courses from industry experts
      (web development, frontend web development, AngularJS, Android,
        iOS)
    
      Free crowdsourced mentorship platform of programming
      exercises and code reviews
      (Clojure, CoffeeScript, C++, C#, Elixir, Erlang, F#, Go, Haskell,
        JavaScript, Common Lisp, Lua, Objective-C, OCaml, Perl 5, PL/SQL,
        Python, Ruby, Scala, Swift)
    
      Free programming and mobile development courses on iTunes
      from Stanford University
      (programming, startups, iOS)
    
      Paid platform for web development courses
      (JavaScript, AngularJS, Java)
    
      Free intermediate to advanced programming problems
      (programming)
    
      Free practice problems in Python and Java
      (Python, Java)
    
      Free code challenges. Compare your solution with those of
      others.
      (JavaScript, CoffeeScript, Ruby, Python, Clojure, Haskell, Java)
    
      Free Learn to code and game at the same time.
      (C#, C++, Java, JavaScript, Python, Bash, C, Clojure, Dart, F#, Go,
        Groovy, Haskell, Lua, ObjectiveC, Pascal, Perl, PHP, Ruby, Rust, Scala,
        Swift, VB.NET)
    
      Free programming course material for beginner,
      intermediate and advanced levels
      (Python, JavaScript, Data Science, artificial intelligence, machine
        learning, AR & VR)
    
      Mixed guided video courses to build products using new
      technologies
      (JavaScript, CSS, React, Node.js, GraphQL, Redux)
    
      Free Quiz your knowledge of programming
      (JavaScript, Node.js, React, functional programming)
    
      Free courses from MIT on advanced computer science
      topics
      (varied and extensive computer science topics, C, C++, ..)
    
      Free courses from Harvard, MIT, and other universities
      (varied computer science subjects including theory and programming,
        data science, algorithms, …)
    
      Free platform for courses from universities and
      organizations worldwide
      (varied computer science subjects including theory and programming,
        data science, algorithms, …)
    
      Free university-level courses scoured from around the
      internet.
      (varied and extensive computer science topics, …)
    
      Free graphs of interconnected topics required to master
      concepts
      (programming, machine learning)
    
      Free programming challenges and contests
      (artificial intelligence, algorithms, functional programming, machine
        learning)
    
      Free programming challenges, hackathons and contests
      (dynamic programming, artificial intelligence, algorithms, functional
        programming, machine learning)
    
      Free mathematical/computer programming problems
      (programming, mathematics)
    
      Free programming challenges
      (Java, C++, Python, JavaScript, Ruby, C#, PHP and Perl)
    
To the extent possible under law, Karl Horky has waived all copyright and related or neighboring rights to this work.
In lieu of a formal style guide, take care to maintain the existing style of this list.