[bauer]

Idea: Create Anki decks to go along with the material. Anki is flashcard software with spaced-repetition learning.

[cdr]

Big fan of https://sivers.org/srs - would have never started using spaced repetition without it.

[e12e]

I don't know -- if you learn this stuff, it is presumably to use it -- so you'll get repetition from actually doing the stuff? This is quite useless knowledge if you're not going to be using the command line IMNHO (I do use the command line all the time -- I don't see why someone should learn to do that if they're not going to use it though...).