Furnaces are objects use to smelt food, ores, and other materials and things. To craft it, place eight cobblestone in a crafting table with the middle hollow to make a furnace.

To fuel a furnace, use either blaze rods, lava buckets, coal, charcoal, coal blocks, dried kelp blocks, etc.

On the top of the dashboard, put in the thing you want to smelt. For example, (iron, pork, chicken, copper) etc. Pu the fuel in the bottom part of the dashboard and wait for the gray arrow to slowly fully turn white. Once it does, the output will be on the right of the dashboard.