Qt

1. Qt modules overview

   The essential and add-on Qt modules (Core, GUI, Widgets, Quick, Network, and others) and what each provides.

2. Object model

   QObject, object trees and parent-child ownership, and memory management.

3. Meta-object system and properties

   moc, Q_OBJECT, runtime introspection, and the property system with change notifications.

4. Signals and slots

   Type-safe object communication through signals, slots, connections and connection types.

5. Event system

   Event delivery, event handlers, event filters and propagation.

6. Qt Widgets

   C++ widget classes, main windows, dialogs and the widget-based UI model.

7. Layout management

   Layout managers, size policies and building resizable widget hierarchies.

8. Qt Quick

   Declarative, animated user interfaces built with QML items, anchors, states and transitions.

9. QML language and engine

   QML syntax, property bindings, JavaScript integration and exposing C++ types to QML.

10. Model/View programming

    Separating data from presentation with models, views and delegates.

11. Threading

    QThread, thread pools, worker objects, and thread-safe signal delivery.

12. Containers and implicit sharing

    QList, QMap, QHash and other containers, and copy-on-write value semantics.

13. Building with CMake

    Using find_package, qt_add_executable and related CMake commands to build Qt projects.

14. Internationalization

    tr(), Qt Linguist and translating applications for multiple locales.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.

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