As another commentor said, Bazzite is a good bet. It's an atomic OS based on fedora silverblue, so it's very difficult to accidentally fuck up your system, and if anything does go wrong you are able to revert to the previous bootable state.

It also supports the popular patent-encumbered video codecs, as well as Nvidia drivers (with the Nvidia edition), out of the box.

You shouldn't need to mess with the command line at all. It's set up for (non-game) software distribution via Flathub, so you are unlikely to run into software compatibility issues and you don't need to use a command line software package manager.

It does come with basically all the popular Linux gaming software already installed, which is a pro or con depending on your preference.

I reccommend the GNOME version, not KDE, for the smoothest and most straightforward/convenient user experience. (don't come for me)