In today's world of graphical user interfaces, it's easy to forget about the good old days.  However if you do any administration you know how helpful it is to perform tasks from the command prompt.  It is very quick and easy to throw together a batch file that performs various tasks. 

So you don't remember any of those commands?  There is just one word you need to remember.  Help.  If you open up a command prompt and type help, it will display a list of commands that you have access to.  If you need more information on a particular command, such as Tree, just type Help Tree.  You will get a short description of the command followed by the syntax for the command.  Then there is a listing of all the switches and parameters with their descriptions.  For any old schoolers out there, you know that tree /? will also yield the same results as help tree.