The tutorial provides an overview of how to use Sync Gateway and Couchbase Lite to sync the latest Hacker News stories to an iOS app, with a focus on the Background Fetch feature introduced in iOS 7, which allows applications to perform small operations in the background. The guide walks through setting up Sync Gateway using a simple configuration with the walrus database and enabling the GUEST account for unrestricted access. It then details setting up the iOS app with Cocoapods to manage dependencies, fetching top stories from the Hacker News API using a NodeJS script, and saving them to Sync Gateway. The tutorial concludes by explaining how to simulate a background fetch in Xcode, which updates the app's table view with the fetched stories, highlighting how background fetch can enhance the user experience. A user comments on the article noting compatibility issues with Xcode 10.0 and requests a Swift version with the latest Couchbase Lite.