Or (EDIT: whoops, Ctrl not Cmd) Ctrl-A and Ctrl-E, Emacs style. In fact, a lot of Emacs navigation combos work just about everywhere on macOS. I have a keyboard with all of the keys the laptop keyboard leaves off, but I find that I don’t use them on macOS.
Cmd-a is select all in OSX by default and Cmd-e does nothing for me. The capital versions don't do anything noteworthy for me either. In emacs, home/end would be M-< and M-> no? To your point, Ctrl-a/e/f/b/n/p all work as they do in emacs in OSX.
They meant ctrl-a and ctrl-e.
CMD-e used to be "eject selected disk" in Finder/desktop. Will thus also cause the error-"bloing"/"don't know what you want"- sound on most macOS versions, if nothing suitable is selected.
CMD-e is apply the selected text to the search input. Extremely useful, search for the next instance of a word you see on the screen is thus:
Double click word
CMD-e
CMD-g
Don't know what (which program) you are referring to, I was referring to official MacOS shortcuts and the Finder [1] (Search for "Command-E")
Slightly different, in text documents at least. Cmd up/down move the cursor position to start or end. Home/End move the viewport but leave the cursor where it is.