The order of decorating a Christmas tree can vary depending on personal preference and cultural traditions. However, a common approach is to start with the lights, which provide the base for the decorations. After the lights are in place, ornaments are typically added next, starting from the bottom of the tree and working your way up. Garland or tinsel can then be draped around the tree, creating a festive and cohesive look. Finally, a tree topper is added, often a star or an angel, to complete the tree's decoration.