3 Wooden Planks
4 Cobblestone
1 Iron Ingot
1 Redstone Dust
Open a crafting table
Place 3 Wooden Planks across the top row
Place 1 Iron Ingot in the center
Place 3 Cobblestone in the middle row on the left, center, and right
Place 1 Cobblestone in the bottom-left
Place 1 Redstone Dust in the bottom-center
Place 1 Cobblestone in the bottom-right
Craft the Piston