Chalarangelo/30-seconds-of-python

freeCodeCamp is a free, self-paced curriculum for learning to code, published as open source at freeCodeCamp/freeCodeCamp. It's a 501(c)(3) nonprofit funded by donor support, structured around six certifications in its Full-Stack Developer Curriculum, each gated by required projects instead of open-book quizzes. The repository also carries beta language certifications for developers, interview-prep resources, and the code that runs the live freecodecamp.org platform.

You Don't Know JS Yet is Kyle Simpson's book series at getify/You-Dont-Know-JS. The README lists Get Started and Scope & Closures as finished second-edition titles, an ebook called The Unbooks holding draft chapters on Objects & Classes and Types & Grammar, and two titles marked canceled, Sync & Async and ES.Next & Beyond. Every chapter is readable in the repository, and per the README, the series is closed to new outside contributions.

Master programming by recreating your favorite technologies from scratch.

EbookFoundation/free-programming-books is a community-curated index of free learning materials for developers. What began as a Stack Overflow list has grown into a comprehensive resource, now overseen by the Free Ebook Foundation. It categorizes a wide range of content, including books by language and subject, free online courses, cheat sheets, interactive programming tutorials, problem sets, podcasts, screencasts, and browser-based programming playgrounds. Many of these resources are available in dozens of languages beyond English, and you can navigate the collection through its dedicated search website or by browsing the repository's markdown files.