@jean The apps I use most are Tot and Drafts. Tot (used by far the most frequently) for shortform temporary notes/editing. Drafts for longer text that I may want to file away or use elsewhere, either online or in other apps.

I also tinker with a combination of Obsidian and The Archive in an attempt to maintain some reading notes.

On occasion I dip into 1Writer for some longer note editing on iPhone/iPad. On macOS that task usually ends up in BBEdit.