How to Make a Hopper
The quiet workhorse of every farm and storage room. A hopper moves items between containers with no input from you, and almost every contraption in the game leans on it.
The recipe
Five iron ingots in a V around a chest in the middle.
Grab the grid on Astroworld crafting, or pair it with a chest and a furnace.
Pull, hold, push
Everything a hopper does comes down to three moves.
It drags items out of any container sitting directly on top of it, and scoops up items that land in its funnel.
Five inventory slots buffer the items as they pass through, so nothing is lost in transit.
It feeds one item at a time into whatever it points at, about two and a half items every second.
What to build with it
Hopper into a furnace top to feed ore, a hopper under it to pull finished ingots into a chest.
Lock hoppers with a redstone comparator so each one only keeps its assigned item. The backbone of storage rooms.
A line of hoppers under a crop or mob farm sweeps every drop into one chest while you are away.
A hopper minecart rolls along a track and vacuums up items off the ground and out of chests above the rail.
The redstone trick
A hopper given a redstone signal locks and stops moving items. Pair that with a comparator reading a container and you get an item sorter: each hopper holds onto its one assigned item and passes the rest along. It is the single most important redstone behaviour for storage builds.
Quick answers
Feed it from a chest into a furnace, look up the hopper and iron ingot in the items database, or open the crafting recipes for the exact grid.