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How many string lights can be on one outlet depends on a number of varying factors, including the total wattage of your circuit, the type of lights, the energy needs of the lights, and cord specifications. It’s better to play it safe here to protect your circuit, so figure out the max wattage of your circuit, compare that to the lights, and move on from there. Generally speaking, LED string lights require less energy than incandescent bulbs, translating to a higher number of lights per circuit. 

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.

During the holidays, big box hardware stores sell many kinds of clips and hooks made specifically for hanging Christmas lights—including ridge clips, gutter clips, shingle clips, and mounted hooks. It’s best to avoid nails, staples, and screws since they can damage your roof.

To hang Christmas lights on a ceiling without using nails or traditional hooks, you have several damage-free options. Adhesive hooks and clips are a popular choice. For smaller projects, you can use pushpins, tacks, or adhesive putty. Specially designed transparent tape that can hold weight without damaging paint is also effective. For a more creative approach, consider stringing the lights over a curtain rod near the ceiling. If you have a drop ceiling, look for clips and hooks designed to attach to the metal framing. Note that staples can also be used, but may leave small holes.