Both the Workbox Guide and the Google Codelabs for Workbox were the two resources that were most useful to me.
https://developers.google.com/web/tools/workbox/guides/get-started
https://codelabs.developers.google.com/codelabs/workbox-lab/#0
https://developers.google.com/web/tools/workbox/guides/get-started
https://codelabs.developers.google.com/codelabs/workbox-lab/#0