https://www.freecodecamp.org/news/build-a-pwa-from-scratch-with-html-css-and-javascript/
https://devcoffee-pwa.netlify.app/

https://softrade.it/progressive-web-app-cosa-sono-e-come-fare/

https://medium.com/@jranand_io/creating-your-first-pwa-progressive-web-app-in-minutes-7705bcd3d6cb

https://medium.com/james-johnson/a-simple-progressive-web-app-tutorial-f9708e5f2605



https://www.telerik.com/blogs/from-responsive-to-progressive-making-tripxpert-a-progressive-web-app
https://demos.telerik.com/aspnet-mvc/tripxpert/   !!!!!