Heh, no problem, never too late to learn. If you’re coming from Windows or OS X it’s easy to think that the WM/DE is tied to the OS but due to the way Linux is written, the entire GUI stack is separate from the base system. You can have both the old school X Windowing system and the new Wayland installed at the same time, along with many different Desktop Environments and Window Managers. I use SDDM as my login manager and in the upper left-hand corner there is a drop-down to choose the DE and Windowing System.