The answer to 'how to maintain lawn' is to follow a regular mowing, watering, and fertilizing schedule. Mow your lawn to the recommended height for your grass type, usually 2-4 inches, and avoid cutting more than 1/3 of the blade height at a time. Water your lawn deeply 1-2 times per week, applying about 1 inch of water, to encourage deep root growth. Fertilize your lawn 2-4 times per year with a balanced, slow-release fertilizer to provide essential nutrients.
Regular maintenance also includes aerating the soil, overseeding thin areas, and addressing any weeds, pests, or diseases that arise. Be sure to adjust your lawn care practices based on your local climate and seasonal changes. If you encounter persistent issues or need help with major lawn renovation, it's best to consult a professional landscaper.