I use TextEdit all the time to jot down notes, phone numbers, and any time I need to just get some info down super quick.
I forget, sometimes, that it’s a fairly robust text editor (hence the name, I suppose), and there are a lot of great features to be had.
If you need to make a quick outline, TextEdit can be pretty helpful. Though it’s not as extensive as an outlining feature in something, say, like Word or Pages, it can be useful. It’s also extremely easy to use.