Extending your display onto another screen
Extending a display onto multiple screens can improve user's abilities with regards of what they can do with a computer.
An extended display could allow for a user to watch services like Netflix, Hulu, YouTube, and many more on a tv (with compliant HDMI usability (the easiest method))
Go to the Desktop
Click on the right corner of the lower right hand portion of the screen
Right click somewhere of the Desktop and click on Screen resolution
Click on a screen that is greyed out (to highlight the screen and display the options below the selector portion)
Click on the dropdown "Multiple displays" and select "Extend desktop to this display"
Click on the "Apply" button, as directed
If you can still see something on the scree click on the "Keep Changes" button (If you cannot see this step, do not click anything and just wait fifteen seconds)