Great question! In my fourth decade of life I’m finally figuring out the optimal way to do this myself. I’ve forgotten so so many books over the years that I supposedly read. Read How to Read a Book: The Classic Guide to Intelligent Reading by Mortimer Adler. ( https://www.amazon.com/How-Read-Book-Classic-Intelligent/dp/... ) I’ve given this book to a bunch of people on my teams as it also helps with communicating id…
But as of yet I tend to read books cover to cover and either finish them or give up on them along the way. But I do take notes about interesting things, and sometimes I do little experiments with them also. My notes are a bit lazy in that often my notes consist of taking a picture with my phone, but I categorize the photos into certain albums.