What is a ghost, what is Feng Shui, and what is superstition?

I can't answer so many questions at once! Ghosts are the illusion of human sin! (Man is a ghost), I don't have to say anything about Feng Shui. You know, superstition is an unrealistic thing, but you just believe it! Often superstitious is culture! Nowadays, people often don't understand the superstition, and scaring people with science is just an excuse)