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I recommend handwriting notes. See my other comment here[0] for the reasoning.

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I handwrote notes for my uni exams and agree it worked well. I like text files for searchability and portability though.

A folder of text files on my Dropbox. Google Docs would be fine too. Tried other stuff but keep coming back to plain text files!

Anki is great for foreign languages, chemical names, country flag to name mappings etc.

The free version of Remnote or Anki would also work.