Windows makes using multiple monitors easy. Just plug the monitor into the appropriate port on your computer, and Windows should automatically extend your desktop onto it. You can now just drag and drop windows between monitors.
How does having dual monitors work?
Using dual monitors simply allows users to do more on their computers at the same time. Most modern computers can easily connect to a second display at little to no added cost beyond the purchase of a second monitor. Anyone who spends a significant amount of time at a computer could benefit from a second display!