How to understand which method will be called in Django?

Question

Django

Hello, in the documentation
www.django-rest-framework.org/tutorial/1-serialization the page says
"The first part of the serializer class defines the fields that get serialized/deserialized. The create() and update() methods define how fully fledged instances are created or modified when calling serializer.save() "
as I understand it, this means that when serializer.save() is called, either create() or update() is called.
But I can't figure out where and which method is defined will eventually be called create() or update() when calling serializer.save()

Answer 1

And this is not to be understood. At least, I cannot imagine such a case when it is really needed.
There are also methods for a view perform_create()or perform_update()a viewset. There is create()also update()a serializer. Let them implement the final logic of saving or creating an object.