GUIs change, but the command line is eternal. Memorize these 5 commands and a long and happy life awaits.
$cd
change directory. This is how you move
around the file system.
$ls
List, or tell me what's in this directory. This has a
huge list of useful modifying flags, such as -l (long,
tell me the size, ownership, and permissions on each
thing in here too), or -a (all, as in, show me hidden
dotfiles as well)
$mv
Move, this is how you move something from here
to there. This is also how you rename something
even if it's in the right place.
$cp
Copy. Add -r to make it recursive, else it
won't copy directories because it won't
descend into them.
$pwd
present working directory. this
is how you get it to tell you where you are
in the file system.