I have a few evergreen notes that I update as needed, but the most frequent one is simply a list of what books I have on preorder and when they're expected to ship. I have a book buying problem.

Otherwise most of my notes don't get referenced often because they're stores of knowledge, not items related to active projects. I have several reference docs for fiction writing and DnD that I reference and update often because I work on those projects often, but my note on the Zanclean Flood is just obviously not going to come up almost ever. But writing is how I learn, so I wrote about it 🤷