What are six hexagrams, four pillars, magic numbers, strange doors and mysterious spaces, and what are their connections?

Six hexagrams: There are six hexagrams in the Book of Changes. Putting hexagrams in the armor behind An Shiying for divination is called six hexagrams course, which is also called divination method with armor. Six hexagrams divination is the originator of divination and a large-scale divination method.

Four pillars: it is the usual "eight characters". According to the calendar of the Yellow Emperor, based on the date of birth, the year, month and day are represented by a branch. There are four groups of branches and eight characters, so they are called four pillars.

Operation number: it is the general name of all divination. In the past, fortune-telling divination was also called "arithmetic" and "mathematics", so it was called all kinds of divination by operating numbers.

Qimen: The full name is Daoism. It is an advanced skill, which integrates the auspicious and unfortunate characteristics of time, space and people, and studies their relationship to avoid misfortune.

Kong Xuan: "Xuan" refers to the cycle (rotation) of the sky, which is equivalent to the concept of time. "Empty" refers to the arrangement of stars in the sky, which is equivalent to the concept of space. It is a study of the influence of the displacement of stars in the sky on specific people and things on the ground. It doesn't necessarily refer to a specific number of tricks, but it is mainly used in specific Feng Shui schools.

The relationship between them is that all these methods are based on the principles revealed in the Book of Changes.

Most people don't understand. If you want to learn, you must find a master to take you there. But they usually don't accept it.