What is the palm of yin and yang?

The unique secret method "Palm of Yin and Yang of Heaven and Earth" is the only one in the world today and is exclusively owned by our family. It is the only secret of Jiang Dahong, who was called a fairy in the late Ming and early Qing Dynasties, and the only one left in the world. This method originated from the use of the imperial court, and later spread to the people in secret. Its theory is profound and superb. Its meaning is mysterious and profound, with endless changes. It is simple and mysterious, magical and accurate. People who know this method are confidential and handed down from generation to generation in the world by heart method and dictation. Books in the society have never been exposed, and the secrets of two houses and choosing a date are in the palm of six hands. All the secret methods are done in the palm of your hand, and their methods are wonderful and incredible. Those who get this trick can explain all the secret methods of Yang, Zeng and Liao Sanxian, such as the Capsule Sutra, Tianyu Sutra, Salon Sutra, Doubt Dragon Sutra and Shuilong Sutra, and any metaphysical geomantic omen will fail. Whatever you have seen in the past, whether it is a yin house or a yang house, what happened or didn't happen in your family, you can drop in your eyes, and you can casually say your family's wealth, official position, illness, family relationship, business situation and so on. It has the highest accuracy among all factions. Using this method to regulate geomantic omen can urge money and officials, and it will come true soon. For those with the highest academic level in the world today, who are destined to get this secret method, they can learn it in a few days and help others save lives and benefit society.