You can build an automatic iron farm in Minecraft by following these steps:

1.Gather the items required for the iron farm. This iron farm builds a room in the air where 3 villagers will live. A platform is constructed above their room for the iron golem to spawn. This platform will push the iron golem into lava using flowing water. The iron golem drops iron into hoppers connected to a chest.
2.Move up a layer and build your actual farm above the collection system.
3.Build a wall around three sides of your farm.
4.Bring a villager to your farm, then build the fourth wall – effectively trapping them in place.
5.Wait for the villagers to breed and for an iron golem to spawn.
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