Generally speaking, there are 3 types of Qt GUI applications:

1. A QtWidgets application
2. A QtQuick application (QML)
3. A QtWidgets application that integrates a QtQuick widget

We've prepared multiple repositories where each variant is covered:

• Qt6 Widgets + QML template: qt6-widgets-qml-cmake-hello-world
• Qt5 QtWidgets template: qt5-widgets-cmake-hello-world
• Qt5 QML template: qt5-qml-cmake-hello-world
• Qt5 Widgets + QML template: qt5-widgets-qml-cmake-hello-world

All of the above projects are CMake only (no qmake). In some cases, they come with a Dockerfile that offers static cross-compilation to Windows.

To conclude, these projects should help you to quickly get started creating a Qt application. See their README's for more information.