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I learned about Zettelkasten (ZK) in 2020, and then last year I attended a rigorous course styled as a book club that selected "How to Take Smart Notes" by Sönke Ahrens. From that I gleamed that N. Luhmann was a one-of-kind thought leader. It reminds me of composers that aren't appreciated until long after they're gone.

I'm reading (and taking notes) on that book now. Plenty to learn there.

Keep in mind that while we'd traditionally write notes from a book or article on one or several pages, he wrote short notes on multiple pages and then processed them looking for connections to existing notes. His system was a lot simpler than most people realized largely because it relied on a numbering system rather than a hierarchy