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 take digital notes in Apple Notes for knowledge and facts that should be quickly searchable and there is no need for me to remember it.
I maintain multiple digital knowledge graphs (vaults) in Obsidian.md for more complicated and interconnected information, like my work, software development, hobbies etc.
The rest is kept on paper.
Quick notes that I need to take during phone calls or conversations go into one of my Traveller’s Notebook inserts.
I’ve also started using a “concepts” notebook (another TN insert) where I note down new concepts (one per line, without explanation or elaboration, e.g. “acropalypse”, “goodhart’s law”). This helps me with remembering them better, as long as I go through my previous notes regularly and look up things that I no longer can recall.