Learning to be an accurate shooter is absolutely crucial for Battlefield 3. Today I am going to give you a brief overview of how to aim in Battlefield 3 so you can increase your accuracy, conserve ammo, and more importantly survive longer on the battlefield.
The most important thing you can do to improve your accuracy when playing Battlefield 3 is to aim down the sights. Rather than firing from the hip you should be aiming every shot or burst of fire you make to ensure that you better hit your mark. The only exception is if you are using a light machine gun, in which case you can spray fire to keep enemies in cover (this is the whole point of LMGs after all)
You should also be crouching or prone when firing if possible. Prone tends to be better for snipers laying in wait or if you have a very good observation position such as a rooftop to fire from. Crouch works well for all situations; run forward until you see an enemy then crouch behind cover. This will boost your accuracy and also help keep you covered from enemy fire.
Aiming is extremely important to more realistic shooters like Battlefield 3. You need to cut your teeth with basic gameplay mechanics like aiming and cover until you are getting good scores and a favorable kill/death ratio. The best way to learn how to own the game is to read a proper Battlefield 3 strategy guide; click here to see my comparison of the three leading BF3 strategy guides.