Having heard both of these idioms I would like to know if they have the same meaning?
Idiom 1 "I know something/somebody like the back of my hand."
Idiom 2 "I know something/somebody like the palm of my hand."

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    I think you are mixing two sayings: the palm one is "I have you in the palm of my hand," meaning I control you. – Weather Vane Mar 31 '20 at 17:18

There is an idiom - to know something like the back of one's hand, meaning to be very familiar with that thing. There is no widely used idiom involving knowing something like the palm of one's hand.

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