When we first got invested into the APIs related to service workers it seemed overwhelming but then I realized it's actually just a few simple things to start and you grow from there. The whole PWA ecosystem is still sort of overwhelming because it's not even clear what a PWA is.
But start by just building the most basic serviceworker.js possible, caching a few basic assets and go from there to build a basic manifest.json file and you're pretty much there already. PWA is basically just a website that is fast and has serviceworkers installed.
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