Zettelkasten is German for “slip box” and is a method to manage knowledge. Basically, you take ideas from books, articles or conversations and write those ideas on note cards, collect them in a central database, and link them together so that you can start to find larger relationships between concepts you’re learning. — How to Make Yourself Into a Learning Machine, via Irreal
His (Vim-based) system for taking notes remind me of Roam, which I haven’t tested yet.