One way to stick Christmas lights to the wall is to use removable hooks or adhesive strips. These hooks are typically made of plastic and come in various shapes and sizes to suit different needs. To use them, simply peel off the backing and press the hook firmly against the wall. The adhesive on the hooks should hold the lights securely in place without damaging the surface. It's important to make sure the surface is clean and dry before attaching the hooks, and to follow the instructions carefully.