His first form like said above keep knocking back his attacks until he gets hit by it. Then use the longshot to reach him quickly (yes you can use the longshot on him) and attack with your sword until he "dies".
Form 2, Z target his tail and when he swings roll between his legs and shoot his tail with an arrow or attack with your master sword. When he knocks the master sword out of your hands use the bow, megaton hammer or the biggorons sword.
Form 2, Z target his tail and when he swings roll between his legs and shoot his tail with an arrow or attack with your master sword. When he knocks the master sword out of your hands use the bow, megaton hammer or the biggorons sword.