Some keyboard functions are ingrained.
Ctrl-F5, Ctrl-C, Ctrl-S
But some are not.
E.g. by accident i hit the F11 key in Firefox and had to google to find out how to get back.
Luckily I am not alone….
I made my firefox full-screen; how do I change it back?
I was typing a message and accidentally hit more than one key and my firefox went full-screen and I don’t know how to fix it.