How does Ann start her diary? What does she describe in her diary in the beginning?

How does she mature through the course of her diary entries? Elaborate.

Anne starts her diary by talking about the point that prompted her to keep a diary. She always missed a best friend to whom she could confide. So, she decides to treat her diary as her best friend. She begins by giving a brief sketch of her life. She matures in the process of writing diary entries. When she gets punished by her teacher repeatedly; she completes even the extra homework with a sense of ingenuity. She is determined to give convincing arguments about necessity of talking.