calmcode.io is an e-learning platform that I really really really recommend to programmers and data scientists:
It is free.
It involves open source tools.
It uses bite-sized tutorial videos.
It explains tools clearly.
It explains everything calmly.
There’s tons of content about computer programming, data science, and personal productivity.
On top of this all, it’s by Vincent Warmerdam, and everything he touches seems to turn to gold.
Check it out here: https://calmcode.io/
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There are just so many tutorials on so many different topics! Here are some quick glances at some topics and tools:
paulvanderlaken.com 