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Tags and filters are all plugins and I found I could just include my new tag in the exact same file in which I implemented my filter.
My site has many snippets of different languages, and I wanted to tag them for CSS purposes among other possible useful things marking them might make possible. One problem with that is I am still searching out the "correct" labelling, so using mutable tags would be easier to remember as well as change later....
Getting Jekyll running was a little bit of a kerfuffle since I needed to update Ruby, but then Jekyll couldn't find the right version. Eventually this was resolved and I got Jekyll's out of the box test site up and running. The fact that Jekyll has a test server that runs on your development machine is very convenient, even if it doesn't run server side includes and the like.
Officially, filters and tags are plugins so they go into the
jekyll-root/_plugins directory. Once again, no
_config.yml modifications necessary (in the version of Jekyll (3.7.3) that I was using) to enable things.