

If only one side of the bed is touching a wall, then that side is the back. The opposite side would be the front. The remaining two sides would be the sides.
If your bed is in a corner with two sides touching a wall, then I would say both open sides would be considered the front.
If your bed is in a nook with three sides touching a wall, then the one open side would be the front.
If your bed is in the middle of the room and not touching any walls, then there is no front.
Here’s that guy’s mastodon page: https://mastodon.social/@urda
You can see his post there that ended up here.