If you want to learn Ziwei Doushu, you might as well learn the four pillars and eight characters first. If you have time, then learn Ziwei Doushu. Why do you say that? Because Ziwei Doushu has many pits, there are many phenomena of the same dish, and the rate of the same dish in a Jiazi (6 years) is as high as 7%. You can imagine the accuracy of fate.
Let's give an example. The following three Chinese charts were all born in September of the lunar calendar in 196 (there were 25 days from October 22, 196 to November 15, 196), and there were three times of the same chart. Will the fate of people born at these three time points be the same? Personally, I think it is absolutely impossible.
Lunar calendar: the eight characters born on the third day of September, 196 are: Geng Zi Bing Qian Gui Wei Zi. The chart of Ziwei Dou Zi is as follows:
Lunar calendar: the eight characters born on the fifteenth day of September, 196 are: Geng Zi Bing Yi Wei Bing Zi. The chart of Ziwei Dou Zi Zi Zi is as follows:
Lunar calendar: 1966.