Minecraft wiki entry for Survival_with_no_enabled_data_packs, associated text: When you first spawn in the world, the first thing you need to do is to find a farmer villager. This is important, because although one may survive on only apples from chopping down oak and dark oak trees, the only way to make progress up the tech tree is through trading with villagers - this is because there is absolutely no crafting whatsoever in this world. The farmer villager is necessary, because it is the only way to gain emeralds from this world at start, as its initial trades include a trade of wheat, potatoes, or carrots for emeralds. All other trades are either trades that require you to trade in emeralds, which you do not have initially, or it requires you to trade in an item you cannot get as crafting and mob drops are unavailable, or for the cleric villager and shepherd villager, you simply do not have the tools yet to get the item.