The answer to 'how to care for grass' is to follow a regular maintenance routine to keep your lawn healthy and looking its best. This includes mowing, watering, fertilizing, and aerating the soil on a consistent schedule.
Start by mowing your lawn at the appropriate height for your grass type, usually between 3-4 inches. 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 each time. Fertilize 2-3 times per year using a slow-release nitrogen-based fertilizer. Aerate the soil annually in the fall to improve water and nutrient absorption.