Windows key + left/right arrow Use this combination to snap the current window to the selected side of the display. If the window is already snapped, this shortcut "unsnaps" the window and cycles through all three combinations: left, unsnapped, right.
Windows key + up/down arrow Use this combination to cycle through maximized, restored, and minimized states for the current unsnapped window.
If you have multiple displays, the Windows key + left/right arrow combinations cycle through all monitors, in order. So if you select a window on the left display and press Windows key + right twice in succession, it will snap to the left side of the monitor on the right.
Windows 10 supports four window snap positions per monitor, one for each corner. 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.