G5 Book,G5 Shop, Woocommerce are included in the theme so this are required plugins, you need to install/active this plugins if you want to have Book features.
You need to activate the G5 Core plugin for G5 Book to work.
G5 Book Supports you to display and assign authors and writers to books for sale. It's easy to start with a bookstore with unique, beautiful author layouts
With G5 Book plugin, You can specify the author, Display the author list, Display the author's book list, Author filters...
You’ll learn to set up in the document of plugin with G5 Book