Many times, there is a use to have two windows open side by side on one screen. A reason may be when comparing two documents, one document needs to be put on one side of the screen and the other on the other side of the screen. Here is how to easily do this:

Click on the file you want to put on the left side of your screen and then press windows (key) + the left arrow key. Do the same to put the other file on the right side of the screen; press windows (key) + the right arrow key.