If it’s related to the task at hand, I create a comment block inside the ‘main’ file. Sometimes the comments are spread out so I make sure not to commit them to

If it’s related to the task at hand, I create a comment block inside the ‘main’ file. Sometimes the comments are spread out so I make sure not to commit them to git which is easy because I’m a GUI using heretic. Sometimes I even have a single commit that contains all the comments with a simple DELETE ME commit message. I simply move the comments up to HEAD and append new comments to it where necessary. Otherwise I send myself a DM in slack. I actually use slack self-DM for all sorts of notes and TODOs. They’re available on multiple devices, they have an amazing preview functionality for files and urls, they accept markdown to a degree, they’re still around when the power goes out, etc. For something more long term like a journal, I use Bear.app.