Windows 8.1 has an interface designed for touchscreens (Metro) and if you have a laptop or computer that supports it, you can use fingers to navigate and work with programs.
For the new features, Windows shows tips and small windows with tutorials that will disappear after you use that feature for a couple of times.
Although you don’t have a touchscreen device, Windows 8.1 shows this message and you can’t close it.
“Switch between apps. Swipe in from the left edge to go back to the last app .. Begin with your finger outside of your screen”.
If you have a touchscreen device, performing the actions (from the message) will make the message to disappear. But if you don’t have it,you need to close this annoying message.