By typing /home in the chat, the user will be teleported to the last bed they occupied in that dimension.

When using this command in the Nether or End (or any custom created dimension) the player will be teleported to the location they entered the dimension from.

If you haven't slept in a bed yet, a message will appear saying it could not find the bed.

Note: If you sleep in a bed and then destroy it, you will still be teleported to the location where your bed was. This is because Minecraft holds your bed location until you die and the game tries to re-spawn you.