The Hand Signifies Friendship, the Crown Loyalty, And the Heart Love.
In Ireland, America and other places, the Claddagh is handed down mother-to-daughter or grandmother-to-granddaughter.
Engagement ... by placing the tattoo on the left side your body wtih the heart pointing outwards indicates you are spoken for
Wedding (married)...represented by placing the tattoo on the left side of your body wtih the heart pointing inwards towards your heart
Friendship... by placing the tattoo anywhere on your right hand side.