Parenting with Love and Logic by Jim Faye. Awesome parenting class/seminar/books. His logic is simple skills based on common sense parenting and keeping control without losing your cool. Really, I think any parenting class would give a parent a solid foundation. Some people think taking a parenting class is a sign of weakness or unnecessary, but it will be the best love you ever give your children. The only other thing is that teenagers are just smarter two year olds. So, if you can out smart your two year old, you will love your teenagers!!!
I never spanked or grounded. Not saying I don't believe in those methods, just saying I was never driven to use them. Every year my kids grew a year older, I enjoyed them that much more. I love being a parent.