First off I want to say, that Systemd is quite new to me and I always used the old and classic init systems like OpenRC (which is still available on Gentoo—if someone cares about that more than I do).
I’m not so into systemd systems and ever avoided systemd whenever possible, but nowadays systems without systemd are very rare. So I’m learning my lessons slowly and with some memory protection (e.g. this article). Sorry, this article is not very well formatted…