The answer to 'grass turning brown' is that there are several common causes, including drought, disease, pests, or improper mowing and watering. Symptoms include patchy, discolored, or thinning grass. Solutions depend on the root cause, but may involve adjusting watering, aerating the soil, applying fertilizer, or treating for pests or disease.
If the problem persists or you're unsure of the cause, it's best to consult a professional landscaper who can diagnose the issue and recommend the appropriate treatment. DIY solutions may work for minor problems, but a professional can ensure the health and longevity of your lawn.