That's it! You've now learned how to set up the administration site in both its simplest and improved form, how to create a superuser, and how to navigate the admin site and view, delete, and update records. Along the way you've created a bunch of Books, BookInstances, Genres, and Authors that we'll be able to list and display once we create our own view and templates....instances, followed by three placeholders for new book instances (which...