In the first half of this sentence, Yang refers to the house and Yin refers to the grave. As we all know, the geomantic omen of graves is very important to us. Sometimes the location of the tomb can affect the fortune of our descendants, but it costs a lot of money to ask a master to see the feng shui of the tomb. So the first half of this sentence means that for some people who don't have that much money, it is better to ask the master to look at the feng shui of the tomb and what needs attention when building a house.
The second half of this sentence means that when we build a house, the location of the gate is very particular. For example, the threshold of the door must not be made of locust trees, because locust trees have homophonic sounds? Not good? , is a bad sign. At that time, people often thought that the gate was the only place for daily travel and a very important place. So sometimes even if you need to move the grave, you must never change the position of the gate, otherwise it will affect the owner's fortune.
Now many of us are not so superstitious. Compared with Feng Shui, family style is actually the most important reason that affects the decline of a family. So you can't just rely on feng shui, you have to work hard yourself. We should also believe in science and not just rely on superstition to meet our own needs. After all, now is a scientific society, and many good wishes can no longer be realized by superstition alone, but by our own efforts.