Books

Highlight with a 4 color pen in outer margins on each page. Red important, blue interesting, green for your own thoughts, black for notes which don't fit into any of the categories. Write as short as you can notes in top and bottom margins. If I use an e-reader I just highlight instead of red and write down notes after reading chapters or finishing the book. When you're done reading, it's great if you try to find a way to use that knowledge - blogpost or article, video, podcast, conversations in real life, real life politics, anything to make you actually use it and remember.

Edit: Having books easily accessible, setting goals for reading sessions, and not subvocalizing for hard texts are also good tips. By reading goals I mostly mean "Today I would like to read X pages or for X minutes because I know I have time, and I know that if I read that much I'll be good to read more tomorrow", not "I'm gonna force myself to read Y everyday no matter what" - build a habit, not an obligation. I would also say having a hard text, like capital, that you need to work through and a easier text that you can just read whenever is a good pairing.

I hope this helps.

https://lemmygrad.ml/comment/7280642

Well maybe just figure out what really needs to be memorized and what is not necessary for you (you do not need to know exact statistics if you are just trying to understand a Marxist work)