Located at the top left of the Author Central page, the Reports and Marketing tab provides the option to create book recommendations and access to some basic sales information: 

Book recommendations
Here you can recommend books you and others have written. 

Amazon followers
Readers who to follow you on your Author Page will receive notifications about your new book releases. Following you increases the likelihood that readers will see your new books while browsing on Amazon. If they allow marketing emails from Amazon (and your book is eligible, and the customer hasn’t already pre-ordered the book) they will also receive email updates. The Amazon Followers link on Author Central allows you to track how many followers you have. 

Sales rank
This section shows where each of your books ranks within its category. While sales rank can also be found on each book’s sale page on Amazon, Author Central consolidates all this information in one place. 

Weekly sales report
Here you can find sales data for your bestselling books. This report does not reflect all sales. More detailed data on sales can be found in the ‘Reports’ tab in KDP. 

Customer reviews
This section compiles all customer reviews for your books in one place, making it much easier to monitor feedback without visiting each individual book listing.