I don't really have a "methodology" per se, I really just focus my tags on the terms I would use if I were to search online for the same thing, or even as a category to keep bookmarks for a specific topic organized. As an example, for all the web resources I may use when playing Star Citizen, I tag those web sites with #starcitizen, for sites that may have given me guidance on doing something on the linux cli, I tag it #linuxcli. I also really don't obsess over the "cleanliness" of the tags and such, but instead just use Linkding as a database that I can search. I'm not sure if this helps, but hopefully it does!