How can I properly install step flashing on my roof to ensure proper water drainage and prevent leaks?

To properly install step flashing on your roof, you should first ensure that the flashing is made of durable material like galvanized steel or aluminum. Next, place the flashing under each row of shingles, overlapping them to create a watertight barrier. Make sure the flashing is angled to direct water away from the roof and into the gutters. Seal the edges of the flashing with roofing cement to prevent leaks.