The Legend of Zelda: A Link to the Past/Heart Pieces

Heart Containers
This explains where to get all the Heart Containers

There is a Heart container in the Sanctuary in the Light World.

Pieces of Heart
This explains where to get all the Pieces of Heart

In the Theives Hideout in the light world on the bottom floor there is a wall that can be bombed, use a bomb and get a Peice of Heart.

In Kakariko Village in the light world there is a well in the North-West of the village, fall down there, collect the bombs in the chest and about 2 squares left of that there is a wall that can be blown up, get the piece of heart behind the wall.