The officially recommended solution is to create a user profile model. It should have a one-to-one relation with your user model. All the additional user information is stored in this model:

class Profile(models.Model): 
    user = models.OneToOneField(settings.AUTH_USER_MODEL, 
                                on_delete=models.CASCADE,
                                primary_key=True)

It is recommended that you set the primary_key explicitly to True to prevent concurrency issues in some database backends such as PostgreSQL. The rest of the model can contain any other user details, such as birth-date, favorite color, and so on.

While designing the profile model, it is recommended that all the profile detail fields must be nullable or contain default values. Intuitively, we can understand that a user cannot fill out all their profile details while signing up. Additionally, we will ensure that the signal handler also doesn't pass any initial parameters while creating the profile instance.