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Go through: https://www.w3schools.com/ and check some more 'practical' things like: https://mystery.knightlab.com/
StratScratch has 'FAANG' or whatever interview problems, which are much closer to real world scenarios, but still quite contrived. Similarly, https://advancedsqlpuzzles.com/ is pretty good and goes through some extra steps - recursive CTEs/etc - but is a bit outside of the norm.
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.