Developer Roadmaps
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Roadmap.sh
Provides clear, step-by-step visual roadmaps for various developer career paths (e.g., Frontend, Backend, DevOps).
Interactive Coding Practice
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freeCodeCamp
Offers thousands of hours of free, project-based learning on web development, data science, and more.
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Codecademy
Provides interactive lessons for various programming languages. Many introductory courses are free.
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HackerRank
Focuses on competitive programming challenges and interview preparation questions.
Free University Courses & Textbooks
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Harvard's CS50: Introduction to Computer Science
One of the best introductory CS courses in the world, taught by David J. Malan. Available for free online.
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OpenStax
Provides free, peer-reviewed, and openly-licensed textbooks for various college subjects, including math and physics.
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edX
Hosts university-level courses from top institutions worldwide. You can audit most courses for free.
Comprehensive Article Hubs
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GeeksforGeeks
A massive library of articles, tutorials, and practice problems for almost every computer science topic. Excellent for catching up on a missed topic.
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MDN Web Docs
The ultimate, most reliable resource for web technologies, including HTML, CSS, and JavaScript.
Video Tutorials
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freeCodeCamp (YouTube)
Features full-length, university-level courses on almost any programming topic imaginable.
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Khan Academy (Computing)
Excellent, easy-to-understand tutorials on foundational computer science and math topics.
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3Blue1Brown
Creates incredible, animated videos explaining complex math and computer science concepts intuitively.