🧉 Martin
Honestly I've never really done anything special. I think plenty of "doing", i.e. using the thing in some way as apposed to (only) writing about it, helps a lot in cementing the concepts in your head. Having said that, from a purely note-taking perspective I do nothing more clever than write in Notes.app (macOS) following no particular kind of system, I'm afraid. Hopefully there are other pro note-takers who have better advice for better note taking.