Feng Shui does exist, but in fact it pays more attention to the influence of nature on a certain place. Take a simple example: You won't build a house opposite the parking lot, because there will be through flow when it is windy, which will bring inconvenience to your trip. In fact, this is what Feng Shui theory is about, but there are always some people who make a fool of themselves and make ghosts and legends out of it. A truly responsible feng shui master will put objective things first. Many people don't believe in Zhouyi because it is mixed with the theory of ghosts and gods, but it is indeed a non-modern scientific explanation of China's science.
As for the training class, you can't consider whether it is true or not.