[zokier]

What Wayland really is a way for multiple applications to get access to and share dri/drm and evdev (kernel interfaces for putting stuff on screen and getting input respectively), nothing less and not much more. To enable that Wayland defines an IPC channel which is designed for extensibility, and there are some defined extensions to cover more desktop-like usecases (clipboards and whatnot). Some extensions are more widely supported by different compositors than others.

For links, this docs page listing many (all?) wl extensions kinda gives you an idea what wayland core does not handle, and also what in general is available through wayland: https://wayland.app/protocols/