how does mulligan work in magic

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how does mulligan work in magic?

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101.4 A player who is dissatisfied with his or her initial hand may mulligan. First, the starting player takes any mulligans. To take a mulligan, that player shuffles his or her hand back into the deck and then draws a new hand of six cards. He or she may repeat this process as many times as desired, drawing one fewer card each time, until the hand size reaches zero cards. Once the starting player has decided to keep a hand, those cards become his or her opening hand. Then each other player (in turn order) may take any number of mulligans. A player can't take any mulligans once he or she has decided to keep an opening hand.