To make a Christmas star for a tree, you will need some supplies. First, you will need a wire hanger. Bend the hanger into a star shape by wrapping the two sides around each other to form points. Next, wrap the star in metallic tinsel or ribbon to make it shine. Finally, attach it to the top of the tree using some wire or ribbon. You can also decorate it with ornaments or other small trinkets for added festive touch.