Minecraft wiki entry for Things_not_to_do, associated text: The End, with its barren wasteland, easy access to the item-destroying Void and deadly mobs, is extremely dangerous, and even more so if you bring the wrong equipment or run out mid-travel. Endermen are formidable enemies that can catch an unsuspecting player unawares if looked at accidentally, and especially if tunneling between islands, and can easily fling you into the Void. This would be catastrophic, considering that if you are in the End at all, you would be in your best armor. Always bring food, because the only source of food in this dimension is the somewhat hard-to-collect chorus fruit, and you need food to heal sustainably, as well as sprinting and not starving. Bring plenty of materials - which endermen should not be able to pick up - to make bridges between islands, staircases and pillars to get to higher ground and avoid being hit by angry endermen and extra tools if you need them. As well as that, it would make returning much easier if you place a lodestone on the main End island, or the End gateway you came out of, so that you can align a compass to it and always be able to get back home. A pair of ender chests, one in the player's base and one in their inventory, can allow access to the items inside across dimensions, but a pickaxe with Silk Touch is required to pick it back up. Elytra and fireworks, if the player has them, are extremely useful for air travel between islands, unless the durability is low and the player has no means of repairing it.