As already stated, torque is to do with the way the shaft twists (or resists twisting) when you load it - i.e. when you swing.The higher the rating the higher the ball will fly but it may be more difficult to maintain accuracy and the softer it will feel. A shaft with 3 deg of torque will feel much stiffer than a shaft with 5 deg for example. Its not quite true to say that a level of 3 deg is for Pro's. There are many more properties, such as bend profile, kick point, etc etc that need to be taken into account when chosing a shaft. That's where custom clubfitting comes in!!