If you want to find out more about Dianetics and Scientology, the best way to do this is to read an L. Ron Hubbard book on the subject. I personally recommend you read Scientology: A New Slant on Life.
This book helped me understanding more on how to communicate to someone so that they could really understand me. It also helped me understand what happens when someone is mad or happy or "depressed". Just those basic tools go a long way.