Will defensive driving reduce your insurance rates? If so, by how much?

"Easily buy a used-car from the private-party a few hundred miles from me how do you legally generate the vehicle back to be authorized in my own state of PA. Insurance company was called by me and so they said they cant provide me protection till it's registered nevertheless from when i obtain it from their website the individual who possesses the car should have  insurance   to address me on the road back