mar2112 It's the desktop manager that will feel more or less familiar to a Win 11 user. I'd stay away from Gnome and KDE and go with XFCE or LXQT as these will feel familiar.
I don't know if I'd recommend XFCE or LXQT to a beginner. These desktops are more simple and minimalistic, which is fine if that's what you're looking for, but when compared to Windows' feature set, or KDE/Gnome's, they could feel like a downgrade, and kinda limiting. Depends on the user's needs and their hardware (xfce/lxqt are amazing for low-powered machines), but I'd say, if you have the processing power, go for a full-featured desktop environment, which runs modern Wayland (XFCE and LXQT run on X11 session instead, which is not as secure and not maintained anymore).