Why do I take notes? So I remind myself stuff when I invariably forget.
You can use vim to keep notes in plain text. Several plugins are available to help with this:
You can manage your tasks locally with something like Nullboard: https://github.com/apankrat/nullboard
toodoo app on android is lightweight except it hasn't been updated for use with SAF, so can't export your tasks.
todo.txt format is interesting, although yet to find (search for) a TUI tasks with calDAV support on linux.
This document can be thought of as a style template for markdown notes. It's just a thing to help keep these text files somewhat consistent.
https://ctq.ro external link description