One of the best is to learn how to see the path created by the line. This fact can be used to help deliver the cue properly. The thin grey line represents the center of the cueball. Once you have determined the line and path to the object ball, be sure to focus on the object ball when you stroke. Use the path to see how to deliver the cue ball, but be sure to keep your eye on the target, not the path, when you stroke.
Many shooters use the ghost ball technique of aiming.
This is just a matter of deciding where to deliver the cue ball, and to imagine the cue ball resting against the object ball at the point of contact. A less reliable method of aiming, but one that is good for certain shots is the distant point aim. First, line up the path to the object ball and notice where the center of the cue ball would hit the rail if it could travel through the object ball without deflecting. If you line up the path correctly, and aim the center of the cue ball at the selected point on the rail, the cue ball should contact the object ball on the target spot. Most cut shots require a slight adjustment for throw.