I’m exploring the Zettelkasten system right now. It starts with notes and ideas, and then progresses through organisation and links. I have some software and books to investigate, but I’m excited by the possibilities.
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.