I go midway there. I stick in one a4 size folded paper in each book I am reading. Thoughts, references, names, dates, quotes, aha moments all go into that one

I go midway there. I stick in one a4 size folded paper in each book I am reading. Thoughts, references, names, dates, quotes, aha moments all go into that one page. Usually read a chapter, re-read it and then take notes, not while reading. Page goes into a binder when I complete or drop the book. I like the index of one page summaries I've built up this way. Also nice to see my thought processes evolving.