What does "everything is not suitable" mean in the yellow calendar?

There are several cases of "everything goes wrong" on the calendar: 1, the earthly branch of that day collided with the earthly branch of that year ~ called "year-old break"; 2. The collision between the sun and the moon is called "breaking the moon"; 3. The "four days" in the 24 solar terms ~ that is, the day before beginning of spring, long summer, beginning of autumn and beginning of winter ~ are called "four days"; 4. The days before the vernal equinox, autumnal equinox, summer solstice and winter solstice in the 24 solar terms are called "four seasons". The so-called "everything is not suitable" means that it is not suitable to do big things, such as getting married, opening a business, traveling (going out of town), laying the foundation stone, moving into a new house, etc. It doesn't mean normal things in daily life!