UV bulbs shoudl be removed and stored insided. Make sure it is entirely drained of all water and stored somewhere it will not get inadvertently broken.
External pond filters should be cleaned. Store inside or winterize them per the manufacturer’s directions.
Small pumps used for spitters should be disconnected and brought indoors. Free standing concrete fountains and birdbaths need to be covered for the winter to prevent them from cracking.
Decorative items such as floating islands and pond decor will last longer if stored indoors for the winter.