Minecraft wiki entry for Guardian_farming, associated text: 1 Spawning
2 Preparing the monument
3 Farming
3.1 Spawning area
3.2 Transport and killing
3.3 Item collection and waiting
4 Designs
4.1 Manual farms
4.1.1 Guardian Chamber
4.1.2 Guardian Drop
4.2 Automatic farms
4.2.1 Iron Golems
4.2.2 Super-efficient farm
4.2.3 Minecarts
4.3 Conduits
4.4 Nether Portal