Tag Systems
buttondown.email/hillelwayne/archive/tag-systems
What Jamie wrote
This is a delightful blog post that walks through several different approaches to "tags" in systems. This is a great example why a request to "add tags" to a product is so completely lacking in clarity that there is nothing that you could do. It also highlights how different tagging approaches will work better or worse for the specific problem that you are trying to solve.