I have to be honest, I just take notes on paper. It is not optimal for finding stuff across old notebooks though. If I had today's technology back when I star

I have to be honest, I just take notes on paper. It is not optimal for finding stuff across old notebooks though. If I had today's technology back when I started, I would probably digitally record it with something like an Apple pencil etc. If it was all OCR'ed I would print it with an index in book form.