Isn't there any PDF about Qt 5?
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Hi and welcome to devnet,
Have a look "here ":http://qt-project.org/books for books related to Qt. AFAIK there's currently only one book for Qt 5 and it's in french.
Unless you are using some very specific stuff from Qt 5, the books about Qt 4 still provides a very good ground to build on. Otherwise, the documentation, examples and demos are a very good source of information.
As for the reasons, generally, writing a good book takes lots of time and experience and Qt 5 is not that much old.
Hope it helps
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Yes...I found one link on Web
You can learn Qt 5 via tutorials on following linkHope ,it'll assist you or anyone who wants to learn Qt 5.
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if you are interested in QtQuick, "here":http://qmlbook.org/ is a good online book.