Lately I've been watching the Distributed Systems Course on Youtube and really enjoy the teaching style.
If you skip the lessons on Blockchain (I'm not really interested in that) it roughly takes you 2 laid-back evenings or one tour de force evening.
Also while I watched the lesson on the CAP Theorem I remembered a quote by Joe Armstrong which really resonates with me:
Make it work, then make it beautiful, then if you really, really have to, make it fast.
90% of the time, if you make it beautiful, it will already be fast. So really, just make it beautiful!`
Although I never met him I miss his positive attitude:
Prediction.— Joe Armstrong (@joeerl) April 6, 2019
One day computers might become useful