Is there a good resource for people who are used to non-systemd systems (something like a gotcha list)? I keep on running into weird situations where I end up f

Is there a good resource for people who are used to non-systemd systems (something like a gotcha list)? I keep on running into weird situations where I end up finding out systemd is somehow responsible for my woes. Last time that happened was when I changed /etc/fstab but somehow old mounts kept on being remounted, I wasted an hour before I found out I had to reload some systemd service.