I've been doing it a lot too, but in my notes app! As soon as I run into /any/ problem be it just once, esp. if I had to Google the solution, I plop in the problem + answers into a note, and include the source (just in case), and it has saved my butt so. many. times.

From how much water to use to boil macaroni to 'how the eff do I make exported pngs in Affinity transparent!?' to 'oh thank GOD i took a photo of the instruction booklet before i tossed it out' when i had to figure out how to pair our bluetooth controller to the pc again...