To tie a Christmas bow with ribbon, start by cutting a length of ribbon that is at least twice the size of the gift box you're wrapping. Fold the ribbon in half lengthwise so that the ends meet, and then create a loop with the right side of the ribbon over the left side. Bring the right side under the left side and pull it through the loop to form the first knot. Repeat this process until you have at least 5 knots. Tie the bow in a symmetrical and balanced way, and adjust the loops as needed to ensure a neat and tidy appearance.