An open-source curriculum that teaches full-stack web development, Python, data science, and machine learning. The curriculum includes interactive coding challenges, projects, and certification paths — all accessible online for free. It’s the most-starred GitHub repo in the world, with over 400,000 stars and tens of thousands of contributors.
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FreeCodeCamp
www.freecodecamp.org/learn
github.com/freeCodeCamp/freeCodeCamp