Well in one of the walkthroughs it says that 3 of the heart pieces that i need
Hyrule Field: Near the path leading to Lake Hylia, there's a section of grass that's fenced in on all sides.
Throw a bomb into the center of that area to uncover a secret grotto containing a Piece of Heart.
and 2:
Lon Lon Ranch: At the north end of the ranch, there's something odd about a tree there.
Detonate a bomb at the base of the tree to reveal a secret grotto with a Piece of Heart.
and 3:
Gerudo Valley: On you way to Gerudo Fortress, you'll see a waterfall.
Dive into the river as close to waterfall as you can get then climb the ladder behind
the water fall and a secret chamber should be there and you'll find the Heart Piece there.
Please give me more specific details step by step.
this is the last time