Transferring items between chests is a common task in Minecraft. There are a few different ways to do this, but the most common is to use a hopper. A hopper is a block that can be used to transport items from one inventory to another. To use a hopper to transfer items from one chest to another, simply place the hopper next to the first chest and the second chest next to the hopper. The items in the first chest will then be automatically transferred to the second chest.
Hoppers can be used to create a variety of automated item transport systems. For example, you can use hoppers to create a system that automatically sorts items into different chests. You can also use hoppers to create a system that automatically feeds items into a furnace or other machine.