What organization app do you use? (notes/todo etc.)

Notes app, available via iCloud on all my Apple devices

Notes and Reminders.

Notion

Obsidian - https://obsidian.md/

Ticktick for todo list. Notion for note taking.

https://noteplan.co/ for a couple of years now. That I'm not hopping around from app to app anymore is a good sign to me that it's working.