From the beginning of the book to the end Rob changed a lot. For example, in the beginning of the book Rob held everything back and didn’t talk to anyone, especially his dad. Then at the end of the book after the tiger died he started yelling at his dad and was super mad. Then, Rob finally calmed down and eventually talked to his dad and everybody else a lot more.
Lessons I think Rob learned from this emotional rollercoaster is to not hold things back. Also to talk to people because they might want to help you. Another lesson is maybe to hold on to the good things you have because you never know what’s going to happen to them/you. That is how Rob changes and the lessons he’s learned.