Can you give me a link to that documenation and tooling?

Linux daemons and utilities typically come with manuals that get installed alongside the software. There’s a command line tool, aptly called man, that can be used to search and display these manuals. So for instance, man resolvectl displays the manual for the command line utility that you can use to control, configure, monitor and debug the systemd-resolved daemon. (Although I usually look up the man page online because it’s more convenient to scroll through than in a terminal.) Man pages for a given daemon will typically mention near the bottom related man pages for e.g. control utilities like resolvectl, so it’s not necessary to remember it by heart.

a week later they all have different configurations.

I’m trying to remember any situation where one of the systemd components would change its configuration on its own, but I’m coming up blank. It may be my memory failing me, but possibly that’s the wrong tree to bark up?