Exercism
Code practice with human mentoring.
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About Khan Academy
Khan Academy offers free courses from arithmetic to economics with mastery-based practice — the non-profit standard for foundational learning.
Key features
- Mastery-based practice
- K-12 through college content
- Teacher and parent tools
Pros
- Rigorous and truly free
- Excellent math progression
Cons
- Limited advanced CS content
- Video-first pacing isn't for everyone
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