I'm summarising the Essentials Textbook atm. I find that the notes I've made probably wouldn't be universally helpful to everyone - I ignore anything I know confidently but anything I'm even the slightest bit shaky on I write down. I go by exercises and title everything. All formulas are noted down as well, as well as some reminders for things I personally always forget/do wrong.
Last year, for Revs, I annotated handouts in class (best way to take notes when you're in a rush, imo) and sometimes made a weekly summary, especially if there were concepts I struggled with.
With humanities subjects, I find that your notes are almost always all over the place - there's so many different sources of notes (stacks of reading/class notes/textbook notes etc) and a lot of these sources are saying the same thing. I spent a whole weekend each term going through EVERYTHING (which takes a while) and putting it into 2 A4 pages which I used as my cheat sheets for SACs. At the end of the year, these cheat sheets were like gold for reivising fr the exam.

There's no real right way of taking notes, imo, and I changed note-taking methods so many times last year.

It's just a matter of playing by ear and doing whatever works for you at that point in time.