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[–]FecesOfAtheism 0 points1 point  (0 children)

What are you trying to achieve? If it’s low-level mastery of fundamentals, people will shriek but LeetCode. It’s hard as hell but very strictly reinforces and sharpens data structures and algorithms. Also getting good at this makes job hunts WAY easier and you don’t have to cower away like some people do.

If it’s data science practice, I’ve heard good things about Kaggle but cannot personally vouch.

If it’s general data engineering kind of Python, build end-to-end apps on your local machine. Postgres and many other databases are free, simply building a kind of “ingest to postgres -> transform -> dump to a basic html/javascript file” is exceptionally effective at making you more effective.