Part 1 here: https://www.youtube.com/watch?v=mTNdTcwK3MM

This second part shows you how to turn an existing web app into a PWA using the browser API. Once you understand the ServiceWorker, you can use a library like workbox to help you build a more robust ServiceWorker easier: https://developers.google.com/web/tools/workbox/

Code: https://github.com/marcushellberg/bad-news