In palm reading, left is inborn and right is acquired, which means the left hand represents your inborn fate while the right hand represents your destiny affected by the acquired environment. The principle reflects the saying of ''people's fate are governed by God while fortune created by themselves''. In other words, the reading of right palm is dominant, accounting for about eighty percent while the left is passive, accounting for about twenty percent. Therefore, the right hand shall be regarded as the principal while the left supportive in palm reading.
https://www.yourchineseastrology.com/palmistry/which-hand-to-read.htm