How to distinguish the front and back of a house in Feng Shui (the direction your face faces after opening the door in the morning)

In the past, houses had a front and a back. The front was for facing and the back was for sitting. The front and back of the current house are not obvious, so it cannot be said that the current house is not a house; just like there were only horse-drawn carriages in the past and no cars, we cannot build cars now. We can only think that using traditional Feng Shui concepts to evaluate modern houses is the old-fashioned carriage driving technology guiding modern car driving technology, which is outdated.