Rebel without a cause
Jim Starks Traits
Another trait of Jim's, is that he is peer pressured and a troublesome kid. This trait is shown throughout the whole show because he always seems to be getting into some trouble or anther person is. This was probably his biggest trait. A time in the show where he showed this was when him a buzz played chicken because he was peer pressured into it and he actually wanted to do it.
My answer: The biggest thing that Jim learned was that he didn't have to be a chicken to prove anything to others and that he could be himself.