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Practice small questions on coding katas like this? https://www.codewars.com/
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On a somewhat related sidenote, there is the Open Source Society University which offers free, non-conventional (and non accredited) coursework that you can practice at your own pace.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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You can try HackerRank or Edabit (which is paid eventually) to do "sandbox" problems. There are also open textbooks discussing Python and the Python for Everybody course.
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Exercism - Scala Exercises
Crowd-sourced code mentorship. Practice having thoughtful conversations about code.
Codingbat.com for practice on the basics, other sites like hackerrank.com, codewars.com, exercism.io, codingame.com, codecombat.com, and just searching for "Programming problems" will get you a bunch of problems to practice with.
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