When a Blueprint is being created there are some suggestions for common classes to be used as the Blueprint Parent class. These common classes are known as "Gameplay Framework" and are used to represent players, characters, controllers and game rules.
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To use another class as Parent class, just expand the category "All Classes" and search for the desired class. The classes "Actor Component" and "Scene Component" allow the creation of components using Blueprints.
The image below shows the hierarchy of the common classes. The arrow indicates that the class below is inheriting from the class above. There is a base class in Unreal called "Object".
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