Like the revolver and the lever-action carbine, the shotgun is still around because it gets the job done and gets it done quite well.
You can say what you want to about your favorite defensive school or those advanced-fighting techniques you learned, but the greatest defensive skill that a person can develop is simply awareness. I will freely admit that developing effective awareness is anything but simple, but being able to spot trouble before it is close enough to get in your face will certainly save you from a lot of trouble and possibly even some pain and grief.
Training with and relying on a partner can be a pivotal element of any personal defense preparedness.
When we can, we need to tell the new shooter that they really need to learn to walk before they can run. And then we need to help them find the kind of training that will give them the basics of safe gun handling and marksmanship.
Once the armed citizen has advanced to the point that he or she can draw and shoot their defensive handgun safely, accurately and quickly, it would be a very good idea to start adding movement to the defensive response. Movement has the potential to momentarily confuse and surprise an attacker, allowing the citizen to gain a bit of advantage.
What is a suitable quick-draw time, and how important is that for the armed defense with a handgun?
Recently, I was told about an incident down at our horse barn where a lady was bucked off her horse, suffering a badly broken ankle among other injuries. There were several people in the vicinity, but only one of them took immediate charge of the scene.