This question is about "Holes", by Louis Sachar
Answer and Explanation:
1. Despite the difficult times he has been facing, Stanley had a good family base that taught him to find lessons in bad luck and difficulty. This makes him stronger spiritually and mentally, knowing that everything that is going on is an apprehended one. He was unjustly condemned to a type of reformatorio, but he uses it to promote good and build a high confidence that he never knew he had, but that was necessary to support everything he was facing.
2. Stanley was always abused at school and did not have the courage to stand in his own favor, on the contrary he always felt diminished and wronged. When he really found himself caught up in a real injustice, he realized that just by taking a stand, finding his threats and fighting them he could survive. The difficulties challenged him in a physical way (due to the obligation to dig huge holes every day) and psychological (due to the constant threats he received from the director of the reformatorio) and overcoming them stimulated these two elements in his body.
3. He discovered that the abuse caused by the director and the obligation to dig holes was due to something the director was looking for. From that information he got together with the other boys and managed to shape his situation to his advantage, since the information gave him power.