Q: Headlights, lights, brakes, steering go out & car won't start

While driving home, the headlights on my car slowly went out. Also, the anti lock brakes, power steering, and all the lights went out. At this point my car would not start. After replacing the battery, the horn wouldn’t work and a light continued to come on. The dealership reset the computer and now… the day running lights don't work when I start the car. They only come on after I've put the car in Drive. Plus, the airbag sensor is out. Could you please give me a diagnosis and what needs to be done to fix my car. Thanks.