

Hard to summarize, because it differs so much from person to person.
I installed Linux on my parent’s computer. They don’t need to know anything about Linux, because everything they use is identical to their old Windows PC. They click the icon for Chrome to open the browser. They Click the icon for LibreOffice to type up a “Word” doc and print it by clicking “file > print”
As far as they’re concerned, they are still using Windows.
For a gamer, they will need to know a little about Proton, possibly Lutris and the Hero launcher. They might need to know about installing nVidia drivers or tweaking a few things in the Steam launch options to get games to run better.
It’s tough to know exactly what a new Linux user will “need” to know in order to use Linux.
True, it still does vary even chipset to chipset. Some Nvidia and Intel cards do just work depending on the distro, others require more work.
It also depends on how “techie” the user is. My parents are 0% techie, so I have to do anything and everything for them if they have questions or issues.
But a Windows power user can handle some terminal use and other basic system modifications. And honestly now days, most of that stuff is super easy. Like Linux mint has a dedicated driver app that allows you to use a simple GUI to install Nvidia drivers, it’s super easy.