Primarily, you have to inspect your roof from time to time particularly after a significant storm. Big storms can lead to damage to your roof.
Scan the roof surface and look for holes, and ignored shingles. When there's ice or snow on the outside, don't walk on it since it may be quite dangerous. If you inspect the roof many times, you'll be more likely to find changes and problems as they appear. Check out this link to hire the best roofing company.
Secondly, you should clean your roof regularly. Get rid of the debris and dirt that has built up on your roof. You can use a tall floor broom to brush off the dirt, but don't brush too hard because you can damage the surface.
You should avoid using a power washer to clean the roof. The water pressure is too intense and it can damage your roof. However, you can use water and a tri-sodium based cleaner to clean your roof. Apply the water and soap to your roof and let it sit for a while.
Use the broom to scrub the roof gently and rinse the surface with cold water when you are finished. You should rinse the surface before the soap dries.
Thirdly, you need to take care of your gutters. The gutters are an important part of any roofing system because they help water flow away from the roof.