What does the year of the dark horse mean in the eight characters?

howdy

In the prediction of the Book of Changes, it is divided into 12 zodiac, with a life span of 30 years and a life span of one year every two years. There are five elements in all. Horses are divided into white horses, dark horses, red horses, green horses and yellow horses. You are a dark horse, which means water horse. This kind of life is a bit suspicious, but you do things safely.