I’d love to be able to use paper notes, but I’ve always found writing physically uncomfortable, and my writing is so bad that even I can’t necessarily read old

I’d love to be able to use paper notes, but I’ve always found writing physically uncomfortable, and my writing is so bad that even I can’t necessarily read old notes! And how do you find “all the notes about GCC” without some kind of library index system? So for me it’s text files in Markdown, shared between my devices, with a variety of ways to search and display them.