There’s a tonne of stuff online. Medium is a good starting point.
Zettelkasten — How One German Scholar Was So Freakishly Productive
Luhmann wrote over 70 books and more than 400 scholarly articles using the Zettelkasten notetaking method.
The zettelkasten post
Hat tip to the always-interesting newsletter by David Moldawer, which turned me on to zettelkasten. You should totally subscribe to it if…
If nothing else, I can see how this could see me writing more and better. Right now I lose a lot of ideas that could maybe progress into something good. Assembling a lot of unrelated ideas and shaking them up together could easily spark some “Aha!” moment.