Mob Farm, hostile mobs, XP farm, creeper farm, skeleton spawner, Enderman farm, spawn mechanics, mob cap, dark room spawner, gunpowder farm.
Avoid building general mob farms in "River" or "Mushroom Field" biomes, as these have different spawning rules that can drastically reduce your rates. Mob Farm
Place four double chests on the ground and connect hoppers to the back of them. Cover the hoppers with slabs. Mob Farm, hostile mobs, XP farm, creeper farm,
The mob farm is proof that in a blocky, rule-based world, cleverness can turn even monsters into a manageable harvest. And in games where resources mean progress, that’s the most valuable drop of all. Cover the hoppers with slabs
Type of that uses Wither Roses (which kill mobs instantly). Wither skeletons are pushed onto the roses, dropping their skulls and coal. High risk, massive reward.
The Ultimate Guide to Building and Optimizing Your Minecraft Mob Farm