Well, there's the theme of the brutality of war. It's there in the background, constantly threatening the safety of Anne and her family. And then there's the theme of family. We see how they support each other, but also have their tensions in the confined space. There's also the theme of the value of a written record. Anne's diary has become a powerful testament to that era.
One key theme is the power of hope. Despite being in hiding, Anne still held onto hope for a better future. Another is the importance of self - expression. Her diary was a way for her to express her thoughts and feelings during such a difficult time.
The themes of isolation and the human spirit are prominent. Anne and her family were isolated in the Secret Annex, yet her diary shows how the human spirit can endure. Also, the theme of growing up in abnormal circumstances. Anne was a young girl going through adolescence in a very restricted and dangerous situation.