Import your notes and files to the Notes app - Apple Support

Take the text files that you created in other apps, and import them into the Notes app. Then you'll have all of your notes in one convenient place.

Import from Apple Notes - UpNote User Guide

TECH TIP: Import Your Notes and Files into the Mac Notes App

Create notes on iCloud.com - Apple Support

Save and edit PDFs to the Books app on your iPhone or iPad - Apple

Stickies User Guide for Mac - Apple Support

Notes – Fastmail

How to Create Local Backups of Notes on Mac

Create and format notes on iPad - Apple Support

macOS: How to Export Apple Notes as Plain Text Files- The Mac Observer

Draw or write in Notes on iPhone - Apple Support

How to import Apple Notes to Pages on iPhone, iPad, Mac

Export Notes as PDF on iPad OS 14 - Apple Community

Importing documents into Craft – Craft

Share notes and folders on Mac - Apple Support

DEVONtechnologies How to Switch from Apple Notes