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Exercism
Free coding practice in 70+ languages with mentor feedback.
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- Oct 29, 2026
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- exercism.org
Exercism offers free coding practice in over 70 programming languages, with optional feedback from volunteer mentors.
Why it is worth a bookmark
- Learn a new programming language
- Solve exercises locally or in the browser
- Get human mentor feedback
- Learn idiomatic code
Good to know
It's completely free and run by a non-profit. Mentors give friendly feedback that helps you write cleaner code.