Ah, the age-old question: how to hang Christmas lights on an outside tree. There are many methods you could try, but here's a simple one: start by wrapping the lights around the trunk of the tree, making sure to keep them close to the branches. Then, begin working your way up the tree, looping the lights around the branches as you go. As you get closer to the top, make sure to secure the lights with zip ties or duct tape so they don't fall off in the wind. Don't forget to test the lights before you hang them to make sure everything is working properly. Happy decorating!