Hi,
To learn Felgo development, you can see our documentation and tutorials. There’s also a comprehensive online course available on Udemy: https://www.udemy.com/learn-qt-qml-v-play-and-keoba/ (it uses the “V-Play” module, which is now Felgo, the types and principles shown still work the same though!)
As Felgo extends Qt and uses QML for development, you can also see resources for learning QML in general. E.g. there are tutorials in the Qt Documentation.
We can also highly recommend this QML guide/book: https://qmlbook.github.io/. It is an online book about Qml and features a lot of tutorials from basic to advanced.
Cheers,
Günther