For Many People, Two Monitors Are Better Than One!
It all depends of what kind of person you are. if you are like in a business, you might need this so you can view many files at once. On the other hand, if you just use the computer for fun, one is enough. Two monitors gives you the option of opening more windows at one time. It also lets you have a bigger desktop space to put your stuff. In order to have two monitors, you must have 2 video outputs. It either has to be a VGA or a DVI. You might already have one, so you would just to buy a video card, and plug it in. Need more info, please follow this link.
Difficulty Level: Intermediate