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However, if you do just want some small challenges to practice then I found CodeWars to be pretty good. It starts you off with easy challenges and then progressively levels you up to harder ones.
https://exercism.org/ has a diverse set of problems that focus on different areas of the language such as working with strings, arrays, tuples, etc.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.