How to make an automatic mob farm in Minecraft to easily earn XP and items

To make a mob farm in Minecraft that automatically spawns and kills enemies, you'll need stone, trapdoors, chests, hoppers, ...
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Easiest Mob XP Farm – Minecraft 1.21+ (No Spawner, Java & Bedrock)

Need XP fast in survival? This tutorial shows you how to build the easiest mob XP farm in Minecraft 1.21+ — no spawner required! Works in both Java and Bedrock Edition, fully survival-friendly. What ...