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Exercism - Scala Exercises
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Advent of Code
Exercism is pretty good for beginners with some programming language, they are open source and worth contributing to.
Hey, I'd recommend W3Schools. Although not up to date it's a great platform to test out fundamentals and get a small environment quickly for simplicity sakes.
Codewars is a good platform. Here you can practice code kata's daily in your preferred programming language. Link: https://www.codewars.com/
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