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Yes, you must use an extension cord specifically rated for outdoor use to power outdoor lights, such as Christmas lights. Extension cords intended for indoor use lack the protective properties to withstand exposure to outdoor elements. To safely hang and power lights outside your house or in your yard, always connect them to an outdoor power source using an outdoor-rated extension cord.

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. 

Between seasons, inspect cords for damage, replace burnt-out bulbs, and clean lighting fixtures to prevent dirt buildup. Proper storage in cool, dry conditions will extend the lights' lifespan and minimize repairs or replacements when redeployed.

Repairing a strand of Christmas lights will save you a few dollars and the hassle of going to the store to purchase new ones. That may or may not be enough to make fixing them worth it to you. However, if the lights are already hanging or around the tree, removing and replacing them is far more time-consuming than performing a quick repair job.