Double back hand
Forehand
Overhand 
UnderHand
Firm Grip
If I know how to play tennis, then I will be able to play with my dad. And it will also bring us closer to each other, as I seldom see my dad at home, as he will always busy with something else. Hopefully, it can improve our relationship. At a same time, I hope I can become a good player. So that, I can go for competition, and win some medal for me to display at home.