The left hand is yin and the right hand is yang. Why do fortune-tellers look at their left hands and women look at their right hands?

The left hand is yin and the right hand is yang.

The left hand stands for 2,4,6,8, 10. Right hand stands for 1, 3, 5, 7, 9. When the hands are closed, this is a big number.

No, it's too late. It evolved from Yi, that is, Yin is mostly Yang and Yang is mostly Yin.

Like a hexagram, it consists of two yang hexagrams and one yin hexagram, but it represents the eldest daughter. You can make an analogy.