If I want to truly understand something and retain information, I slow down my reading to a crawl and start taking notes on index cards. I then later transfer

If I want to truly understand something and retain information, I slow down my reading to a crawl and start taking notes on index cards. I then later transfer those index cards into notes on my computer into equivalent "cards", which let me edit or rework the information on the fly. Sometime, I transfer some of the information into Anki SRS, requiring yet another rework into flash cards, and permanently anchoring the information into my brain.