There are only a few things to learn. Generally (not always) macOS is pretty consistent.
There is always the Menubar at the top of the screen with the same basic well labelled menus, worth reading them and familiarising yourself as to what is in them.
Full screen is a relatively recent option and in virtually every App, designed to give more screen real estate for Laptop users. Esc always gets you out of it, and you can always see it by mousing to the top, just as you can always see the Dock at the bottom, if it is hidden, by mousing to it.
Everything, from the Mac itself represented by the , has a mostly similar and familiar set of menus top left of your screen. The Information and Preferences for whatever you are in (/Finder/Apps) are in the Object's menu.
Standard Menus are Apple / App / File / Edit / View/ Window / Help in that order, with others as necessary.
The menu titles are exactly what they say and because you Print your file it is under the File Menu.
Most things work from the large down to the smaller details, left to right, top to bottom.
If you pay attention to these basics you'll learn the rest soon enough. I won't overlead you with more details, but feel to ask when you hit something else, Apple has been losing the plot lately and been hiding stuff they shouldn't.