There's nothing new in books about writing fiction, only on how they're presented.
Some are written by academics and you need to be one to understand them. Others are written by authors who use them as a means of self-aggrandizement constantly quoting examples from their own work. These may not necessarily be good examples of what they're trying to demonstrate, but they're not about to let an opportunity to promote their work slip by.
In Characters and Viewpoint, author Orson Scott Card uses straight forward prose and not a lot of examples from his own work and gives good insight into these two important aspects of writing fiction.
This is a solid book about what is stated in the title.