Ah, fixing Christmas lights can be a challenge, but don't worry, I'm here to help! First, turn off the power to the lights to prevent any electrical accidents. Then, locate the broken wire and carefully remove the bulb or other broken piece. Next, check if the wire is frayed or damaged. If the wire is still in good condition, you can use a needle-nose plier to twist the ends together and wrap them with electrical tape. Finally, test the light to make sure it works properly. Good luck and happy holidays!