Minecraft wiki entry for Shelters, associated text: While you were gathering cobblestone and coal on your first day, you most likely dug a small hole in the side of a surface cave, or staircase down through the dirt. In either case, you can use that hole as a shelter. Dig a few more blocks into the hill or cave wall, then you can dig a small room (8×8×3 is the most recommended. It's not too small, but not too big.) Relocate your crafting table and furnace in here, and make sure to light it up!