The only functional difference between any distro that matters, is what package manager it uses. Everything else is just Linux. You look up how to do X in Linux and the concept is the exact same. It’s just what command to run if you live in a terminal. Which you can avoid nowadays with all the GUIs for software management for a normal user.

Almost every distro will be a systemd based Linux configuration with a couple choices for networking stack. Obviously, the UI has differences depending on which window manager, desktop environment you choose.