Whether it’s a form of note-taking or regular repetition or the like, what are some self-education techniques and tools you’ve developed to help yourself learn on your own?
It’s always interesting imo to read about how some folks teach themselves different stuff.
Don’t buy things from Amazon. Go to your local book store, or direct to the website of the book you want to purchase.
Have you heard of Bookshop? For physical books they seem a decent option, albeit their reach is limited at the moment to the US, UK, and Spain.
Outside of that, and suggesting folks check their libraries, I’ve nothing else to add to your good suggestions.