Hi,
1) To learn what they don't/do like to do.
2) Not to be too hard on them.
3) To share with them your thoughts.
4) Always listen to what they want to tell you.
5) To spend more time with them.
6) To try to be their friend.
7) To give them advice when they are lost.
8) To be their role model.
9) To show them how to look at things at different angles.
you can talk about people need to give teenagers spaces, what they need to put around the house, how should they talk to teenagers, what teenagers like to do, etc.
you can start out with introducing what teenagers are like, then you can say things about how teenagers like to be treated, and then what people can do if they need to deal with a teenager, and end with how the changes might influence the relationship between the teenager and the adult.