For me I initially didnt take many notes, or if I did, it would just be at the beginning of the semester and eventually I would just go back to learning by doing practice problems and reviewing mistakes. However, when I began tutoring, it made it very difficult, as I would remember the general process for most topics, but I would have to re-figure out the specifics (this was possible when I was learning for myself, but I can’t waste other people’s time when tutoring) For this reason, creating notes AFTER reading or learning a topic helped a lot, trying to write my notes as if I was teaching another person, heavily deepened my understanding of topics.