This is an introductory tutorial to getting started with Qt/QML and Felgo to design multi-platform apps for desktop (Linux, Window & macOS) and mobile devices (iOS & Android). A complete app is developed in this tutorial: NASA Astronomy Picture of the Day app.
https://mechatronicsblog.com/getting-started-tutorial-qt-qml-and-felgo-astronomy-picture-of-the-day-app/
