If this book were a podcast, then this would be the point at which I would be imploring you to rate me on iTunes (or I’d be telling you about a really good mattress). Instead, I’d like to give you some hyperlinks so that you can explore some of the topics in this brief book in more detail.
Explanations
Mariko Kosaka wrote and illustrated an explanation of service workers in a post on her site called “Service Worker, what are you?” (http://bkaprt.com/go/10-01/).
Mariko also wrote and illustrated an explanation of promises called “The Promise of a Burger Party” (http://bkaprt.com/go/10-02/).
Google released a collection of scripts and tools for going offline called Workbox (http://bkaprt.com/go/10-15/).
To get started with your manifest and service worker, you can paste your website’s URL into PWA Builder (http://bkaprt.com/go/10-16/).
Lighthouse is a great testing tool for progressive web apps that’s now bundled into Chrome’s Developer Tools under the Audits panel (http://bkaprt.com/go/10-17/).
Documentation
Over at the website of the World Wide Web Consortium (W3C) you can dig into the details of the Web App Manifest specification (http://bkaprt.com/go/10-18/).
The ever-evolving service worker specification is on the W3C’s Github account (http://bkaprt.com/go/10-19/).