The answer to 'how to maintain shower' is to regularly clean and inspect your shower to keep it in good working order. This includes wiping down surfaces, removing soap scum and mildew, and checking for any leaks or damage.
Start by giving the shower a thorough cleaning once a week using a mild detergent or baking soda and vinegar solution. This will help prevent the buildup of soap residue and mold. Wipe down the walls, floor, and fixtures to keep them looking fresh. Check the caulking around the shower enclosure and tub, and re-caulk any areas that are cracked or peeling.