Exercism — Learn to code in 70+ languages
Free, open-source practice platform with exercises and human mentoring across every language in this directory.
Official links
Exercism teaches
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Python
Language
Python is a programming language that is simple, versatile, and widely used.
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Go
Language
Build fast, reliable, and efficient software at scale
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Rust
Language
Empowering everyone to build reliable and efficient software
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Ruby
Language
A Programmer's Best Friend
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C#
Language
A Modern, Open-Source Programming Language