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https://learnxinyminutes.com is good when you know how to program but just need a quick look at the syntax and idioms of a new language.
For practice I like CodeWars because once you finish a challenge it shows you other users’ solutions. A problem is that the other solutions are upvoted, and the top answer is usually the “cleverest” or makes use of some weird language quirk. But somewhere in the Top 5 you’ll find an answer close to what “normal” code would look like in the chosen language.
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.