"cd" is short for "change directory". You use this to go from one directory (or folder) to another. You have a couple of different ways to use this command, and here comes a few examples of them.
# Go back one folder cd .. # Go to a folder (in the same folder you are) cd folder_name # Go to a specific path cd /var/www # Go back to the folder you were in cd - # Go to your home folder cd ~
This is usually the "cd" commands I use. If you got any good tips for other ways to use "cd", please leave a comment below.