To make a Christmas tree in Minecraft, you'll need to collect some specific materials: 10 blocks of wood, 1 block of glass, and 1 redstone block. Once you have these materials, place the blocks of wood in a triangular shape to form the tree's trunk. Then, use the glass block to create the star on top of the tree. Finally, place the redstone block at the base of the tree to give it a glowing effect.