Let me suggest that if there are dozens of different tools that can obtain and manage Let’s Encypt certificates, an instructions page that has those very words on it would be extremely helpful! Not that I’m ungrateful that all this exists, but that alone would at least have helped me understand and realize that I need to figure out what tool I have installed and check its documentation. Icing on the cake would be a list of such tools.
It would be extra super wonderful if the people who wrote those tools (I realize that’s not what this forum is about) would point out that one should make a note of how one installed the certificates, so that when renewal rolls around, one will have a clue.
I’ll repeat – I’m grateful all of this exists and I realize it is mostly or entirely created and maintained by volunteers, so I understand why things are sometimes a bit less complete and friendly than in the for-profit software world (of course, the opposite is often true!).