In celebration of the holidays my two latest e-books, iOS 12, tvOS 12, and watchOS 5 for Users and Developers, and macOS Mojave for Users, Administrators, and Developers are on sale in the Apple Books store. Each title is $2.99. The titles are on sale until 12/31/2018. The books make a great companion to those who might be getting an iOS device or a new Mac for the holidays.