I write notes for my personal and professional interests and I have OneNote notebooks that align to these two area. My personal notebooks are stored in my personal OneDrive account while my professional notebooks are stored in my company's Office 365 space.
My personal notes are less structured and I liken them to a Common Place notebook. My professional notes are more structured in a format similar to Getting Things Done.
Professionally, I mainly have two main notebooks, one is for general purpose work related information and the other is daily journal. I also build project specific notebooks as part of my Microsoft Teams teams and channels.
The daily journal may be of most interest to other people. I labeled the notebook "Today" and it has 13 sections:
1. Quick notes: for miscellaneous notes 2. Today: a note for each day, with subnotes for each meeting during that day