The Yast2 GUI system admin tools made my transition from Windows super easy. It was like the Windows old school control center. You can change your kernel boot parameters via GUI, adjust services and the enabled/disabled and other stuff via GUI, add or remove packages with check marks. You could probably do everything without touching the command line.
A lot of that has now moved to a cockpit-client launcher, which is just OK, doesn't have the same buttons and knobs as YAST.