Hey there! Do you have any dogs? I have a pit bull, shes 6 years old now I think
No.  I don't have a dog.  How is her temperment?
Hers is okay, shes had some anxiety issues and can be destructive to my belongings and house, and my other dog (husky) does not do this, so thats hard to deal with. I keep her seperated from everyone just incase, I dont want her to bit anyone
I don't know about all the different pitbull breeds, but I do know they were originally developed as fighting dogs.
Yes they were, there are so many different variations that fall under the words pit bull, because any dog that has the distinctive pit breed in it is considered a pit bull no matter how much. If it looks like one it is one. 
Yes.  The American Pit Bull Terrier, American Staffordshire Terrier, American Bully, and the American Bulldog, and Staffordshire Bull Terrier are all considered Pit Bulls.  So many!
Yes! Nice, I cant name them all haha. Mine is very strong, so I can see why they were used as fighting dogs, and I think a certain amount of that temperment runs in their blood, but I think a  good responsible owner can make a big difference in how that trait that was passed down comes out in each one
I read where they can be good family companions and great for driving livestock.