Kind of a broad question. I wonder why people take notes - Is it for studies or learning? Is it just to remember things? Is it to make your own map of your knowledge? Is it because you just want a place to vent out your feelings into the void?
What do you use to accomplish that? App? Paper? A chat room?
Even if I just write it down then toss it 2 minutes later, the act of writing something down or typing it up helps me remember better, than just looking/reading something.
If I do keep the note around then I use it as a reference. My handwritten notes generally are formatted in fancy but messy bulleted lists to help me disseminate information quickly and easily, and I’ll add quick diagrams with arrows if needed.
Typed I just write it all out, only adding bullets, tabs or other formatting if I have time.