Palmistry began in ancient India spreading throughout the Eurasian landmass to China, Tibet, Persia, Egypt, and Greece. Palm reading is the art of analyzing the physical features of the hand to try and figure out someone’s personality characteristics and predict future happenings.
There are some palmists who believe that all females should use the right hand as the dominant hand and that all males should refer to the left hand.
Another school of thought holds that the left hand shows your potentials while the right hand demonstrates what you’ve been able to accomplish with those potentials.
Still, others insist that your dominant hand is the one that you use to write and to complete most tasks, meaning that it represents your conscious mind, where as your other hand is more demonstrative of your subconscious mind.
( https://medium.com/@norapuell/detailed-palm-reading-guide-fbd9739fbbe4 )