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This is good (and free) practise for beginners: https://adventofcode.com/
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Exercism - Scala Exercises
Crowd-sourced code mentorship. Practice having thoughtful conversations about code.
If you want to start practicing Js to get familiar to the syntax you can check https://exercism.org . Now as others said you have to practice on real life projects too by building applications
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InfluxDB
Access the most powerful time series database as a service. Ingest, store, & analyze all types of time series data in a fully-managed, purpose-built database. Keep data forever with low-cost storage and superior data compression.
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I made one not too long ago that might be used as a starting point.
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.