Qt has power and lot's of conceptual intricacies - that's my ipression after using/learning it for a few months.
Reading a whole book on the subject is unfeasible, because I neither possess the ignorance of "dummies" or "complete idiots" nor enough perseverance and free time. On the other hand official doc pages (even those broad-view articles) are not enough detailed.
Please, provide links to documentation pages, articles, chapters of books which address Qt concepts that are most peculiarly Qt-ish and absolutely necessary to know for a good Qt developer. Or even whole book names ( if they're succinct, targeted for competent audience, and without going into lengthy but trivial examples ).