Before I get into aiming, I want to iterate the fact that you need solid fundamentals for any aiming system to be effective. It will be difficult to learn how to aim if you don’t have a straight stroke! The purpose of any aiming system is to give you a systematic way to calculate aim, which you can use as a reference point. From this reference point, you can adjust for sidespin factors such as squirt, swerve, and throw, as well as fine tune your aim. The physics of billiards