how to create migrations in django

python manage.py makemigrations
python manage.py migrate

$ python manage.py makemigrations <application name>
Migrations for 'books':
  books/migrations/0003_auto.py:
    - Alter field author on book
    
$ python manage.py migrate
Operations to perform:
  Apply all migrations: books
Running migrations:
  Rendering model states... DONE
  Applying books.0003_auto... OK