There is an auspicious day in the zodiac, but it is also taboo. What is this?

There is an auspicious day in the zodiac, but it is also taboo. What is this? In other words, having a beautiful day is not necessarily completely beautiful. Just like people, no one is perfect, and there are shortcomings and advantages. The same is true today. Can't be perfect. If the general direction is good and the mainstream is good, there will be no problem.