The answer to 'how to maintain kitchen' is to follow a regular cleaning and maintenance routine. This includes wiping down surfaces, cleaning appliances, and organizing the space to keep it looking and functioning its best.
Start by cleaning the kitchen countertops, cabinets, and floors at least once a week. Wipe down surfaces with a mild cleaning solution and a microfiber cloth. For tougher messes, use a degreasing agent. Vacuum or sweep the floor to remove crumbs and debris. Don't forget to clean the inside of the microwave, oven, and refrigerator on a monthly basis.