There we were, playing carrom with my three-year-old nephew who happily put the striker wherever he wished and hit and even put quite a few of the whites and blacks in, once even climbing on to the board. I tried telling him that the striker is meant to be kept on the lines and then struck, but my dad said, "Wait, let him learn to use the striker first."
Parenting books are all fine, but no one like your parents to teach you child-rearing, just like everything else.