I’m not experienced at it either and don’t know the best resources.

But what I can usually recommend in case you don’t want to see the usual “THIS-IS-A-PIECE-OF-THE-PUZZLE—COME-BACK-REGULARLY-FOR-MORE-CONENT” stuff, but more in depth stuff: Enter “filetype:pdf systemd” in your search engine. Google or DuckDuckGo will then only spit out pdf files about that topic… And the people who write PDF files are usually more experienced with the topic than those who write blog posts or “how to’s”.

Let me know if that helped in your case… :)