Even though a granite countertop is a hard surface, it can get scratches and marks in it over time. Whether the scratches and marks are from sharp utensils or scratchy surfaces, they are inevitable no matter how careful you are. You can fix those scratches and marks as part of your routine maintenance of your granite countertop.
Be diligent about what you set on your granite countertop. Even a small piece of sand can leave marks. Try to pick items up to move them rather than sliding them across the granite. Train your family members to do the same.
Try to remove scuff marks first with some soapy water and a soft rag. With enough pressure many marks disappear.
Remove tougher black scuff marks left by pans with ultra-fine steel wool. Lightly rub the marks until they disappear.
Purchase stone cleaner to remove really tough marks. The manufacturer of your granite countertop probably has a recommended brand for you to use. Be sure to follow the directions carefully.
Apply stone penetrating sealer at least once a year to add extra protection to your granite countertop. Purchase the brand recommended by the manufacturer of your granite countertop. Follow the directions on the sealer for application. Allow the product to dry well.
Hire a reliable granite countertop repairman to fix any scratches that you can't remove with the steel wool. Although you may be able to do it yourself, you have a lot of money invested in the granite countertop to take a chance on leaving it looking worse.