Is a diary a good way to learn about world war 2?

I think that a dairy is a good way to learn about World War 2. It gives you more of a way on what the people are experiencing, what they are seeing and what is going on around them. A dairy gives you more on a personal view. In this book I didn't really learn about anything about World War 2 though, it focuses more on on whats going on in the attic.