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Link is a very powerful character who's melee attacks are definitely the highlight of his arsenal. Using his button attacks are a very wise idea as he can do tremendous amounts of damage with them.

[edit] A-attacks

Normal
	Jab
+ +	Dash Attack
Tilts
Light +	Upward Tilt	Link does a 3 move combo hit that if your opponent is on you or right next to you, will hit them 3 times with the last hit sending them to the air.
Light +	Downward Tilt
Light + Light +	Forward Tilt
Smashes
Hard +	Upward Smash
Hard +	Downward Smash
Hard + Hard +	Forward Smash
Aerials (used in the air)
	Neutral Air Attack
+	Upward Air Attack
+	Downward Air Attack
+	Forward Air Attack
+	Backward Air Attack

[edit] B-attacks

Buttons	Attack	Explanation
	Boomerang	Link throws a projectile that returns to him, so it can damage an opponent twice in one throw.
+	Spin Attack	Link performs a circular attack with his sword. You can use it to propel yourself upward when in mid-air.
+	Bomb	Link pulls out a bomb to throw. Usually does between 5-10% damage and leaves opponent temporarily stunned.