I wonder why people take notes
It improves recall and comprehension.
Is it for studies or learning? Is it just to remember things? Is it to make your own map of your knowledge?
Yeppers.
What do you use to accomplish that? App? Paper?
Usually use paper, but GoodNotes is also a good app for this. Combine Cornell Notes with the method of loci and other advanced memory systems (Google Books link) for best results. Huge game changer.