To put ribbon garland on a Christmas tree, follow these steps:
1. Start at the top of the tree and work your way down, making sure the ribbon is evenly distributed. You can use a wire hook or some tape to secure the ribbon in place.
2. Loop the ribbon around the tree in a diagonal pattern, creating a zigzag look. Make sure to overlap each piece of ribbon so that it covers the entire tree.
3. When you reach the bottom of the tree, cut the ribbon and tie it off with a knot. You can then add some ornaments or other decorations to complete the look.