Move an inaccessible window

Do you have a window that the title bar has moved off the screen and you can't reach it with your mouse?

Do this:
Right-click the taskbar icon for that app and choose Move, then press the Down Arrow Key just once. Your mouse now has control of the window. Use it to move the window where you want.

(if Move isn't available, choose Restore. If Restore isn't available, you might have your icons "stacked", so choose one from the stack.)