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Christmas lights typically do not need to be grounded like electrical circuits in your home do. However, it's crucial to use outdoor outlets equipped with ground fault circuit interrupters (GFCIs) for added safety. GFCIs can help protect against electrical shocks and are recommended for outdoor electrical connections when using Christmas lights.

You should always hang the lights before the ornaments because hanging lights on top of ornaments can cause some to fall off. If a light sits directly on top of an ornament, it can cause it to heat up and possibly change its color or cause it to crack. 

In the Christmas days of yore, people braved winter weather to staple or tack their Christmas lights onto their rooftops or nearby surfaces like the fascia boards. Problems quickly emerged with that approach. Damage to the roof, even small marks from staples, provides entryways for moisture and similar issues that can hasten roof rot, wear, and associated leaks. Plus, some homes had tough fiber cement boards or other materials where staples and screws didn’t work.

You can take a few steps to prolong the life of your holiday lights. Make sure to replace burnt-out bulbs as quickly as possible to avoid overloading the rest of the circuit and knocking out more lights. Before packing them up each year, plug each strand into the wall to confirm everything is still working. Wrap the lights carefully back into their original packaging or something similar—winding a strand tightly together or leaving it to hang loose in a storage bin can lead to frayed or damaged wiring.