Patch the nail or screw holes by slipping a bit of roof flashing beneath the shingle. Include a bead of caulk or roof cement to the top and base fringe of the flashing to help keep it set up. Protect the fixed area that has a patch of roll roofing. https://reroofing51033.theblogfairy.com/32930625/the-5-second-trick-for-roofing