The answer to 'how to care for lawn' is to follow a regular maintenance routine of mowing, watering, fertilizing, and aerating. This will help keep your lawn healthy and looking its best. Mow your lawn to the proper height, water deeply and infrequently, apply the right fertilizer at the right time, and aerate the soil to allow water and nutrients to penetrate.
It's also important to address any issues like weeds, pests, or disease promptly. If you're unsure how to handle a problem, it's best to consult a professional landscaper or lawn care specialist.