difference between objects.create() and object.save() in django orm

The Django documentation says it is the same. It is just more convenient to make it on one line. You could make a save() on one line too, but it would be more verbose and less readable — it is clear you are creating a new object with the create() method.

create(**kwargs)

A convenience method for creating an object and saving it all in one
step. Thus:

p = Person.objects.create(first_name="Bruce", last_name="Springsteen")

and:

p = Person(first_name="Bruce", last_name="Springsteen")
p.save(force_insert=True)

are equivalent.

The force_insert parameter is documented elsewhere, but all it means
is that a new object will always be created. Normally you won’t need
to worry about this. However, if your model contains a manual primary
key value that you set and if that value already exists in the
database, a call to create() will fail with an IntegrityError since
primary keys must be unique. Be prepared to handle the exception if
you are using manual primary keys.