How do you beat agahinm in Legend of Zelda?

Answer 1

Agahnim can only be defeated by volleying his blue orb-like energy projectiles back at him with either the Master Sword or the Bug Net. The projectiles composed of many orbs will split up and fire in every direction when the hit something. Avoid these and their fallout. When he begins to raise his hands slowly in preparation to shoot lightning, run to the side of the screen to avoid it.

Answer 2

Wait till he shoots a big blue blast at you then swing your sword at hit hopefully it will hit him do this a couple of times to beat him.