How I take notes
Plain files, links between them, and a rule about deleting.
Underneath all of this is one habit: notice, then count.
Noticing is cheap and slightly embarrassing. Counting is the part that makes it stick.
Pay attention, then count.
What I would tell my past self
I do not trust ideas that cannot survive being written down in plain sentences.
So I write plain sentences, link them to each other, and see what the pile looks like after a year.
Related notes: Notice things, measure them, Spreadsheets as therapy.