Glad that you are doing your research Julia. The American pit bull terrier, the only true pit bull, is a very high energy dog that requires a lot of physical and mental exercise. It also may not get along or tolerate any other dogs in the household. They are great with children and humans in general. They are a loyal and strive to please their owners. They are also headstrong and determined to be the boss so early training is important, so they know you are in charge. Long and frequent walks, treadmill, and flirt poles are a few methods of getting these dogs the exercise they require.
Basically, if you are looking for a couch buddy who likes to lay around the house and do nothing, this is the wrong choice of breed. You couldn't ask for a better family dog if your lifestyle fits the criteria.
Joe