Windows 10 supports four window snap positions, one for each corner. You can use this feature to see two equal size windows at the same time. Useful if you want to compare things from. If you have Windows snap activated (It is usually default on), snapping a window into one of these quadrants with keyboard shortcuts takes a double move: Windows key plus left/right arrow, followed by Windows key + up/down arrow.
To snap a window into the upper-left quadrant for example, press
Windows key + left arrow and then, while continuing to hold down
the Windows key, press the up arrow.