[Etheryte]

Apple Notes keep all deleted notes in a trash bin for 30 days, you won't lose anything unless you manually go and remove them.

[macintux]

Deleted notes are easy to recover; deleted text not so much.

[samkon]

This is the real problem I have. If I delete content, move to a different note, and return to the first note, I lose the undo history and any possibility of regaining the deleted text.