The process of putting lights on a Christmas tree varies depending on the type of tree and the type of lights being used. In general, you should first decide on a theme or color scheme for your tree. Once you have an idea of the look you want, you can start by wrapping the lights around the tree trunk and working your way up the branches, making sure to evenly space the lights and hide any excess wiring. For a more natural look, you can choose lights that mimic the colors of real Christmas lights, or you can opt for more vibrant or even flashing lights if you prefer.