https://doc.qt.io/qt-6/qtqml-cppintegration-overview.html needs a revamp:

• The overview focusses exclusively on defining object types as a new, custom C++ class. It should also discuss:
  • Value types (see QTBUG-122015)
  • QML namespaces (see https://doc.qt.io/qt-6/qtqml-typesystem-namespaces.html) which are a lightweight way to expose C++ enums
  • (slightly less important) The possibility of extending existing classes/namespaces (see the QML_EXTENDED* and QML_FOREIGN* macros at https://doc.qt.io/qt-6/qqmlintegration-h.html
• Context properties are now discouraged (see the big warnings at the top of https://doc.qt.io/qt-6/qtqml-cppintegration-contextproperties.html) so they should be de-emphasized. They're still worth mentioning in the overview since the mechanism exists, but they must be accompanied by clear warnings which are currently missing.
• The "Exposing Attributes of C++ Classes to QML" section should not come first, since it is not a standalone topic. Rather, exposing attributes is part of exposing C++ classes to QML.