Interview shameless questions

Interview shameless questions

The differences between abstract classes and interfaces often occur during interviews are summarized as follows:

Abstract class members can have access level, while all interface members are public level
Abstract classes can contain fields, but interfaces cannot,
Abstract classes can inherit interfaces, but interfaces cannot inherit abstract classes.
Abstract class members can have specific implementations, but interfaces cannot.
The abstract subclass can selectively implement the abstract methods of its base class, while the subclass of the interface must implement

In fact, I don't understand it. If I don't do the program architecture, I just have to recite it.
If the High endpoint asks: what is the use of abstract classes and interfaces? Will we be dumb?