What are the common causes of roof leakage and how can it be effectively prevented?

Common causes of roof leakage include damaged shingles, improper installation, clogged gutters, and flashing issues. To prevent roof leakage, regular maintenance such as inspecting and repairing damaged shingles, keeping gutters clean, and ensuring proper installation of flashing can be effective measures. Additionally, timely repairs and addressing any issues promptly can help prevent roof leakage.