Okay, I learned a new thing, the Zettelkasten. I've done half of this in my notebooks for a long time (where each page or set of pages that are about a particul

Okay, I learned a new thing, the Zettelkasten. I've done half of this in my notebooks for a long time (where each page or set of pages that are about a particular topic are linked to the other pages in the notebook also on that topic with a doubly linked list) but the simplicity here is pretty cool.