I use Markdown documents in Git repositories whenever I can. Also try to evangelize for this at work. PRs then include relevant changes to both code and docs and it's beautiful. For personal project docs I use this exclusively. At work it depends on the team, some people don't like it, but most often it is because they don't like keeping docs at all, not because of an alternative preference. I avoid UI and WYSIWYG based systems like Confluence like plague. I personally can't stand them and every time I have to use one I do my hardest to pretend I'm writing Markdown in my head.
For personal agenda I use Apple Notes with basically just a huge list of things to do and events that are about to happen and I curate that list more or less non stop during the day. If something comes up and I'm with people and don't want to be rude and spend too much time on the phone editing things to be in the right order and have all the relevant info captured with them, I just plop a line at the top of the note knowing I'll groom it later.
For personal agenda I use Apple Notes with basically just a huge list of things to do and events that are about to happen and I curate that list more or less non stop during the day. If something comes up and I'm with people and don't want to be rude and spend too much time on the phone editing things to be in the right order and have all the relevant info captured with them, I just plop a line at the top of the note knowing I'll groom it later.