Here’s an easy technique for shooting the cue ball off the rail. It starts with the way you hold your cue. Many people hold their cue with their whole hand, their middle finger, their front two fingers, etc. The easiest style for just a clean, simple shot is to hold the cue with your back two fingers.
This technique will give you very little error. When you follow-through the cue is perfectly straight. However, you can’t get a lot of force behind shots like this, so it’s not ideal for most other shots and that’s why you don’t want to use this technique for general playing.
So, holding your cue with your back two fingers, go ahead and line up your shot and take it. Shoot normally and you’ll more than likely make your ball.