Don't install PyQt-Fluent-Widgets, PyQt6-Fluent-Widgets, PySide2-Fluent-Widgets and PySide6-Fluent-Widgets at the same time, because their package names are all qfluentwidgets.
These PyQt examples show you how to create a desktop app with Python and Qt. Start with "Hello World" or browse the official PyQt demos. You can run every example yourself on Windows, Mac or Linux.