Why can some feng shui masters judge the general situation of future generations by looking at graves? Does feng shui really exist?

Answer your two questions; First, Feng Shui is a science, not a superstition. Real feng shui masters can predict the fate of graves. Among them, Yuan Yun, who made a fortune and became an official, suffered severe disasters in He Yun. Second, the rise and fall of people depends on their luck, or why they are doomed. There are generally three reasons for killing people in graves: first, too many algebras buried in graves will kill people; Second, if the water is not right, it will kill people; Third, people who are wrong will be killed. The latter two are the reasons of Feng Shui master.