Here's this thing.
Deku Mask:
This is the mask Link starts out with. This mask lets you go into flowers and you can launch up to fly a certian destance and you can attack your enamies by spinning and/or blowing bubbles.
Goron Mask:
Follow the Ghostly Goron to the Goron alter by using the Lens of Truth, and play the Song of Healing to him, then he will give you the Goron mask, which changes Link into Darunia. As Goron Link, you will be able to curl into a ball and roll around, and use the strength of the Goron to unleash powerful fire-punches.
Zora Mask:
By pulling the ill Zora in Great Bay onto the shore. Play the Song of Healing to him, and he will leave the Zora mask for Link. Link can swim like a fish, walk on the bottom of the water, create electric barriers to surround himself, and use the Zora fins for long distance attacks, or various fighting combos.
Fierce Diety Mask:
You get this mask by completing all the kids in the moon's challenges. When Link puts it on, he becomes Oni Link. You can only use this mask in boss rooms. By pressing the B Button while wearing this mask to unleash a powerful magic sword attack with the slash attack.

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