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Brilliant Learning Interactive courses that teach math, science, and computer science through hands-on problem solving. Company 로그인 Required 모바일 App recommended The Odin Project Learning A free, open-source curriculum for learning full-stack web development by building real projects. Nonprofit 로그인 Optional 모바일 Supported Khan Academy Learning Free lessons from math to science Nonprofit 로그인 Optional 모바일 Supported Duolingo Learning Gamified language learning Company 로그인 Required 모바일 App recommended Codecademy Learning Interactive, hands-on coding lessons Company 로그인 Optional 모바일 Supported MDN Web Docs Development The official reference for HTML, CSS and JavaScript Nonprofit 로그인 Not required 모바일 Supported freeCodeCamp Development A leading free, nonprofit way to learn to code Nonprofit 로그인 Optional 모바일 Supported Hugging Face AI Tools The GitHub-like hub for AI models and datasets Company 로그인 Optional 모바일 Supported roadmap.sh Development Visual learning roadmaps by developer role Nonprofit 로그인 Not required 모바일 Supported