From a book: This is a redirect from a book title to a more general, relevant article, such as the author or publisher of the book or to its title in an alternative language.
Books should only have an individual article when they meet Wikipedia's notability guidelines and there is enough material to warrant a detailed article.
To a section: This is a redirect from a topic that does not have its own page to a section of a page on the subject. For redirects to embedded anchors on a page, use {{R to anchor}}instead.