Minecraft wiki entry for Trading, associated text: This profession is a must, as it allows you to obtain chain and diamond armor easily. In addition, you can buy bells if you plan on starting a new village. The best way to level it up is using iron. Iron is not too hard to get in large quantities after a large mining session, and it offers decent XP. Diamonds and lava buckets are too hard to obtain in large quantities to be ideal. In Java Edition, one villager is enough to provide a full set of diamond armor, while in Bedrock Edition, at least two villagers are needed.