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Take a look at the QML Book if you are particularly interested in the GUI side of things. It is very practical and well written.

http://qmlbook.github.io/

Have a look at the official documentation: https://doc.qt.io/

I've used it in early Qt 4 times to learn Qt myself, but since it's been a while, I can't attest if the documentation is still as good as it was back then, but a quick gloss over it suggests that it is still as extensive. They seem to be focusing the tutorials on their IDE (Qt Creator), but you can also use it with other build systems (preferably CMake) if you prefer the CLI.

I would download the latest Qt with their IDE QtCreator. QtCreator comes default with tons of examples that range from their very early Qt4.x days to the latest Qt5 content. The examples heavily emphasize QML, which I tend to not use for performance reasons, but all of the examples are well documented.

Do you know C++? If so a very fast way to learn is to clone some Qt projects, poke inside and see what makes them tick.

No I am not comfortable with C++ code. I was under the impression that JS along with QML was a viable option, guess I was mistaken.