Correct me if I am wrong . I have read on many forums that Qt versions which are released after 4.6 are mainly focused on Qt quick and qml and not on Qt widgets because widgets have attained stability . Is that true ? If it is then then the books “C++ GUI Programming with Qt 4, Second Edition “ and “Advanced Qt programming by Mark Summerfield “ which focus on Qt 4.3 and 4.6 respectively are not outdated if I want to learn only about Qt widgets and not about Qt quick . So, should I read those books ?