First, in a house with a cemetery in front of it, people are most afraid of people offering sacrifices to this dead person. They burn paper money and light candles, which may cause fires. People are most afraid of burning their houses. Therefore, people think that a grave in front of the door may lead to the destruction of people's homes and the death of children. Secondly, another reason is that people are full of fear of the dead and think that living in that kind of house will be particularly scary.
Second, there is water behind the house, and people are afraid of high summer. If there is a pond or river behind the house, the water level will rise in the rainy season. Then it may flood your own home, which may lead to the destruction of others' homes.
Third, there is a pond behind the house. If there are children at home, children may play in the pond, which may lead to drowning. Even in the case of rain and wet ground, people may accidentally step on the air and fall into the water when they get to the back of the house. Therefore, these proverbs left by our ancestors have certain basis, not superstition. Although literally superstitious, it makes sense to analyze it, and people in the past had a feudal concept that such a house was unlucky.