Windows Notepad. Simple, plain text. I've developed my own annotation and formatting system (CAPS for titles, single dashes for bullets, indented dashes for sub-bullets, triple-asterisks for follow-up, and so on). I've been using it since Windows 3.1.
I use Google Keep for shopping lists because of the checkbox functionality and sync to Android, but I expect to keep using Notepad until it's sunsetted.
I use Google Keep for shopping lists because of the checkbox functionality and sync to Android, but I expect to keep using Notepad until it's sunsetted.