I have a single folders I call "Notes" with a handful of files that make up the arbitrary groupings and I keep a "notes.md" file in project folders for project specific notes I want to keep about.

For example, in the "Notes" folder, "wkhtmltopdf.md" contains some notes around issues I was experiencing in getting wkhtmltopdf setup in a new environment and the steps I took to resolve them. Whereas "general.md" just contains some Docker commands I do infrequently but can never remember the arguments I need each time and don't want to spend the time reading the docs and crafting the command again.

Periodically I'll spot something in my notes I haven't used in many months and I'll just delete them from my notes. Usually this is because I just remember the command/what to do after a while _or_ because it's just never cropped up again.

As for a public blog reference, here's an example of one that has a handful of blog posts with notes and they've used tags for grouping and looking up later on: https://jwigley.com/