King Dodongo is the second boss of the game, and it's pretty easy, as you can do the whole battle without getting hit once. King Dodongo only has two real attacks, one where he will breathe fire at you if you get too close, and the other involves him rolling around while in a ball. Both attacks can easily be avoided by standing close to the lava, on the little incline.
To do any damage to King Dodongo, you first need to wait until it starts inhaling. When it does this, you need to throw a bomb or bomb flower into its mouth. This will temporarily stun it, leaving it open to just one attack before it starts moving again. It is best to use a jumping attack on it, which causes 2 damage, or a jumping attack with a Deku Stick will cause 3 damage (do that two times to finish it off).
Once it rolls into the lava and is finally finished, grab the Heart Container and step into the blue light. After Darunia talks a bit, he'll give you the Spiritual Stone of Fire. There's a few things you can do before continuing your journey.
