Open, ls, and cd

Learn these basic commands

$ open . #Mac only. 
# On Window type "start ."
$ ls # Stands for list. 
# On Windows type "dir"
$ cd Desktop 

Permission denied error? (Mac Only)

If you get a permissions error somewhere along the line, you might be able to use "sudo", which is your super user account (aka. it's like the admin of your computer that has all the privileges.) Be careful not to overuse this command. For example:

$ sudo pwd