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I have been working with PySide since 2018 when I started my master thesis and in all these years I have not found one definitive course that really covers "everything"
As I said multiple times here the only resource I feel like suggesting (apart from the official docs obviously) is this "old" book on PyQt4: "Rapid GUI Programming with Python and Qt" by Mark Summerfield
It is out of print but can be found... well you know... on the internet 🏴☠️
It is super well written, it has a lot of well thought examples and in my experience most of it is perfectly transferable to PySide6.