How do you actually keep what you read?

I spent years telling myself I read a lot. Then I realized I could not explain most of it a month later. The highlights sat in an app I never reopened. The notes became a folder I never searched.

So I want to ask the people here: what actually works for you?

- Do you take notes, and do you ever go back to them?

- Flashcards, spaced repetition, something else?

- Or do you just accept that most of it fades?

I got obsessed enough with this to build Cosminds around it. It distills what you read and watch into ideas, connects them across sources, and turns each one into a short recall test. We launch on Product Hunt tomorrow, and honestly I would rather hear how you solve this than pitch you.

What is your system?