I learned a long time ago about the importance of using your wrists. When you are young and just learning to hit you are told to use your wrists. From your little league baseball coach to your mom or dad telling you at home in the back yard. It was always preached about using your wrists. Guess What? They were right.
This is the best part of your swing. When you make contact with the ball you want to be halfway through your swing. You should be at  the V position when making actual contact with the ball. (At the  point of making contact you should be at full throttle and the impact you make at this point will determine on how far or fast you hit the ball). Now you are halfway through with  your swing at this point and once you make contact you want to continue through and around with your bat, this known as your follow through, which I discuss next.

As you finish rolling your wrists this is where I feel you get the backward spin on the ball. Backspin and no backspin means a lot in softball or baseball on just how far it will carry. Some players say that they try and hit the bottom half of the ball. The great Ted Williams was known for hitting the bottom of the ball. So it definitely  works. He is only the last baseball player to hit .400. I feel that everybody is different and what works for one person might not work for the other. I myself don't look for the bottom half of the ball. Sure I have seen the writing on the ball as it comes to me at the plate but I just see the ball and hit the ball. So do what works best for you. Notice in the photo's below what position my hands are in when I start my swing and when I finish. I start with my top hand on the bottom and then as I make contact with the ball I roll my top hand over. I will actually finish the swing with my top hand on top.