A
The first and simplest type of yo-yo trick is called the A style. These tricks involve a single "sleeping" yo-yo. A sleeping yo-yo sits and spins at the end of the string and is mostly unresponsive during the process of performing tricks. Tricks in the A category are focused on string manipulation and landing the yo-yo on the string so the string is in the groove of the yo-yo to allow the yo-yo to run along the string or bounce from the string during tricks.
AA
The AA style of yo-yo tricks involve the use of two Imperial-shaped yo-yos used in tandem. The tricks most focused on in this style are looping tricks. Since the tricks involve two yo-yos they also require two hands to maintain the circular looping motion of the yo-yos throughout the display. Variations on the popular around-the-world and tangler tricks, such as when the yo-yo strings are crossed, spun around the strings' point of contact then uncrossed, are the most common variety of trick within the AA category.
AAA
AAA tricks are called string, or long spin, tricks that are performed with two "sleeping" yo-yos. With one sleeping yo-yo in each hand, the yo-yos are spun up from the end of the string to the top then spun around each other in complicated loops and rotations. The Velvet Roll trick, the original AAA styled trick, involved having the yo-yos reverse somersault about each other then catching both of them, one in each hand.
4A
4A, or offstring, style involves having the string tied to the finger but not the yo-yo. The butterfly-shaped yo-yo is typically used for tricks of this type and is usually used singularly. The yo-yo is also generally made extra wide specifically for 4A styled tricks. The yo-yo is often whipped off of the string only to be caught and run along the string for a variety of complex and highly-skilled displays.
5A
5A, or freehand, styled moves are performed with a counterweight tied to the string on the opposite end from the yo-yo. The yo-yo is connect to the string as usual. Counterweights can be either fixed or sliding weights. 5A tricks are performed with the string unattached to the finger. Due to the detachment of the string from the body, type 5A tricks tend to have the most diversity from player to player and allow for greater creativity when creating new tricks.