You can use the command line to move through folders on your computer, just like with Finder on a Mac or File Explorer on Windows.
To see your location in your computer's file system, use the pwd (Print Working Directory) command:
You can get a list of all the files in your current location, using the ls (list) command.
You can even look at what's inside other folders. Let's say you're currently inside
Desktop/ and you want to see what's inside
Desktop/pics/, you can do this:
$ ls pics/
If you want to go from
Desktop/pics/, use the cd (Change Directory) command.
If you decide you've had enough of
pics/ and want to go back up the chain to
Desktop/ you need to do something slightly different.
Desktop/ is one folder up, so you need to do this:
.. means the parent folder, i.e. the folder that the current folder lives inside.