glad to see this guy on here again. I hadn't seen him on HN in a while and I forgot his name so I couldn't google. he's great at explaining advanced math concepts.
In fact I think bookmarks are underrated, I tried various other ways of organizing information (Zim, Org, etc.) and bookmarks are by far the simplest and most effective. For example just tag this blogpost with 'math, concepts'. Then you just type 'math concepts ' in your Firefox address bar and see all related pages. If you setup firefox sync then you can bookmark pages (even from other apps by sharing the URL with firefox and using the 'add bookmark' action), and tag it later on the desktop.