Hang Christmas lights gutter guard is a process that involves installing a protective layer over the gutters to prevent the lights from falling off or damaging the gutters. This is typically done by using a gutter guard or a similar product that is designed to keep debris, leaves, and other objects out of the gutters. Once the gutter guard is installed, you can safely hang your Christmas lights without worrying about them falling off or getting tangled. Make sure to follow the manufacturer's instructions when installing the gutter guard to ensure a proper installation.