Windows Command Lines

Hey, what are some useful window command lines. Things like networking, programming, utility use, ect. I know a few like tracert, ping, and a few more. Is there a way to update. I just want a better knowledge on how useful the command line. I am using Windows 8.1 if that gives you an idea what I am using for my OS.

This might be helpful -

Thank you, will check it out later. Have a good day :)

You can also use command line to create bootable flash drives for windows installation