Air:
Air manipulation: By using circular, evasive movements, airbenders build up massive momentum; this build up of energy is released as massive power. It also allows for wind-based counter-attacks that knock opponents off-balance, mimicking the sudden directional shifts of air currents. Attacks vary from simple gusts of wind to miniature tornadoes and cyclones, maintaining the circular theme. Even a simple movement can create an air gust, and airbenders increase the power of their moves by performing larger sweeps and spins, using the momentum of their movement to simulate larger gusts. This is also demonstrated with their use of staffs or fans to increase or create precision within the air currents.
Air shield: The most common defensive tactic involves circling enemies, suddenly changing direction when attacked and evading by physical movement rather than bending. However, an airbender can still deflect as needed by throwing up gusts of air close to their bodies as a shield. This is rarely to stop attacks directly, and more often pushes the attack aside and away, conserving energy and allowing them to turn the movement into an attack at the same moment. Since air can affect almost all physical objects, it can also be used to enforce the momentum of thrown objects or manipulate other objects (though requiring a higher degree of precision).
Air barrier: This is a more powerful defensive technique where the entire body is surrounded by a dome of air that deflects attacks from all directions.
Air bullets: A technique used by Aang. He causes two or more marbles to spin in a circle between his hands. It could be used to shoot small objects, like marbles, at very high speeds, similar to bullets, but Aang uses the move to impress rather than to attack.
Water:
Earth:
Fire: