How to start using Qt5 for creating apps for iOS and Android
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General and Desktop
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IMO there are not many books about Qt at all.
But there are a lot of online resources available.The most important topics for you are QtCreator handling and QML.
QtCreator Android Development
QtCreator iOS DevelopmentFor QML there is a free open-source eBook available.
Also an official QML docThis should you get covered for the first steps i think.