What is the golden section of photographic composition? Can you tell me in detail? How to do it?

The golden section refers to dividing the whole into two parts. The ratio of the larger part to the whole part is equal to the ratio of the smaller part to the larger part. The ratio is about 0.618. This ratio is recognized as the most aesthetically pleasing ratio, so it is called the golden section.

It is said that in ancient Greece, Pythagoras was walking on the street one day. When he passed by the blacksmith shop, he heard the sound of the blacksmith making iron, which was very pleasant, so he stopped and listened. He discovered that the blacksmith struck iron in a regular rhythm, and the proportion of this sound was expressed mathematically by Pythagoras. Divide a line segment into two parts so that the ratio of the larger part to the full length is equal to the ratio of the smaller part to the larger part, then this ratio is the golden section. The ratio is (√5-1):2, and the approximate value is 0.618. This value is usually represented by the Greek letter Ф.