The Odin Project
The open-source coding curriculum.
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About Exercism
Exercism offers free coding exercises in 75+ languages with volunteer mentors who review your solutions — practice with feedback, at no cost.
Key features
- 75+ language tracks
- Human mentor feedback
- Local CLI workflow
Pros
- Free human code review
- Great for learning new languages
Cons
- Mentor wait times vary
- Not a structured curriculum
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