This type of thing has actually happened to me several times in the past year or so, where I'd be frustrated an obviously good feature doesn't exist, I'd Google it to see if other people complain about the same thing... only to find it exists after all.
There needs to be a word for this...
If I read the manual for everything I've ever used, I'm not sure I'd have time to actually accomplish anything in the end.
Sure, let me spend a day reading through the lists of keyboard/mouse shortcuts for every piece of software I use just to see if there's anything useful in there? No thanks...
Good UX would pop up a balloon informing me of the feature after the first time I held down my left-arrow key for more than, say, keypresses.
Of course, you might as well disregard the manual and discover things on your own as you need them. Nevertheless, it helps to go at this with a mindset of "this feature surely already exists" lest you're compelled to develop a worse version of the feature yourself.
Anyone that hasn't been exclusively using macOS for their entire digital life, or at least years, anyway.
'Command' (resp. 'Windows', resp. 'Super') is a different story. You can't say 'Super' with a straight face without also marking yourself out as someone who borders on saying 'GNU with Linux', or 'I run Arch'.
(For what it's worth, I do run Arch. ;))
IIRC Option is dually labelled as Alt on some Apple keyboards anyway.
Since basically nobody knows the historical difference these days, I just call it the Meta key to avoid the above situation. When non-techy people ask me what the hell I mean, I just explain that's the technical term for the key and that I use it so both Mac and Windows people understand me. I've even heard one of them start using the term themselves, presumably to appear smarter in front of their boss.
<c-a> = go to beginning of line
<c-e> = go to end of line
!! = repeat last command
<esc> b = move "back" one word (also <c-b> and <c-left>)
<esc> f = move "forward" one word (also <c-f> and <c-right>)
Many others exist. See `man bash` under READLINE.
!!enter which is 3 buttons where as up-arrow enter is the same thing.
See sudo !!.
Typically with mouse enabled, you can select text with the mouse, but this doesn't go to the X clipboard. While with mouse disabled, text selected with the mouse goes to the X clipboard.
But actually this depends entirely on the terminal emulator. The Alt/Option key works with the default preferences for iTerm2 on MacOS, but with GNOME terminal I reproduced the same behavior using Shift instead.