I found the best way to retain info, although it’s a lot of work, is to write down questions for myself as I read. Usually a bunch of fill-in-the-blank style qu

I found the best way to retain info, although it’s a lot of work, is to write down questions for myself as I read. Usually a bunch of fill-in-the-blank style questions. I don’t write down the answers as I’m reading though I sometimes put page numbers where the answers can be found. I wait for a least a couple hours after I’ve finished reading, and up to a day, then go back and answer the questions I’ve put in my notes. I’ve found this is by far the best way to force myself to engage and retain info. I’ll also occasionally copy over critical notes to something permanent like Notion or Roam, just to be sure I have a quick reference several years down the line. It’s time consuming, but probably still a time win compared to using multiple sources to learn a single topic.