Below is a description of the listing dir generates. You can change your current directory into any of the directories listed. To change your current directory, type cd and the name of the directory you want to change to. Make sure you separate the cd command and the directory name with a space. This is called giving a command a parameter.
Many commands take parameters that allow for extra functionality and specific data to operate on.
This displays information about the particular command. It's near the top of the listing. This is a common directory that exists in every single directory on your computer. It stands for the directory directly above the current one. It's all a big hierarchy.