O is for Oil
Oil keeps your grill grates lubricated so that food doesn't stick and then fall apart. Dip a folded paper towel in vegetable oil and, holding it with tongs, swipe quickly over grates. Fire up the grill and let the heat cook the oil onto the grate (similar to seasoning a cast iron pan). Keep oil and paper towels by the grill, and swipe before each new piece of food is cooked.