I use a system I created called: Shelf, Desktop, Cabinet.

I use the 'shelf' folder to store all the files I use and reuse (usually, transform) at work. E.g. templates, stock photos, contracts, pieces of code etc.

My actual projects are sub-folders inside the 'desktop' folder. Metaphorically speaking, they are 'sitting on the desktop'. Folders are named like this: 'client_name - project_name'. Whereas 'client' can be anything like: 'me - learning Vue.js'

The 'cabinet' folder files completed projects should be no longer on my 'desktop'. I just move them into there, where they can be easily sorted alphabetically. But before doing that, I take elements that could be reused someday in similar projects, copy them into the 'shelf' folder and give them a generic name that I can easily find through a search.

edit: clarity (I guess...)