work - meeting notes, project notes, tasks, etc. I used Evernote for years for this purpose and dipped my toe in Notion for a while before realizing I really needed offline access.
personal - this is more of a mishmash of stuff. workout notes, progress on books i’ve been reading (sometimes I just write down what page number I got to that day and not anything more elaborate), trip ideas (with links to hotels, restaurants, etc. that sound interesting), a couple reference notes reminding me how to perform certain chores, etc.
Tbh, I don’t use the graph stuff at all. And the information I record in Obsidian is generally not content I’d be able to google.