For super quick notes that are password managed, and markdown supported, I've been using https://nnote.io. Simple, no-ads, and might be OSS sometime soon.

However with nnote, I do end up with a lot of links, and since those notes live everywhere and are hard to manage, I end up making a task in Amna (https://getamna.com) [disclaimer I built it], and use nnote as a tab inside of the browser it provides.