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?
I use it for all the reasons you’ve mentioned. I especially write down recommendations, ideas, thoughts that felt worth noticing, anything I think I’m going to forget that doesn’t go on my calendar or somewhere else, and braindumping/processing my feelings.
I use an app called Logseq, because it combines the things I wanted from some of the other main apps in one place, which none of the other apps manage to do all of:
Logseq does have a moderate amount of rough edges, and has been frustrating from an open source perspective at times (I’ve had PRs linger for over a year before just getting rejected because they didn’t want to bother with it), but it’s still the one I like the most.
FYI though syncing between devices with it is still pretty shaky. They have a native sync for $5/mo that is getting reasonably good, and is in beta. Syncing files via other means is kinda risky/not-great UX.