Before today, I’ve used the terminal to a limited extent of moving in and out of directories and changing the dates of files using the

command. I had realised the full extent of the terminal after installing a fun script on Mac and having to
chmod 755
the file to make it executable afterwards.

I’d like to know what

is, though.
, I assume, is the user of the computer. I’m not sure why
is there, though. It obviously stands for the local computer, but since it’s on the computer (or a server), would it really be necessary? Wouldn’t
be fine?

And what is

? Why is this area usually used for installing scripts onto the terminal?