Express is a web application framework for Node.js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs.
Fly is a platform for running full stack apps and databases.
Google AdSense is a program run by Google through which website publishers serve advertisements that are targeted to the site content and audience.
Progressive Web Apps (PWAs) are web apps built and enhanced with modern APIs to deliver enhanced capabilities, reliability, and installability while reaching anyone, anywhere, on any device, all with a single codebase.