Understand the responsibility of each part of django architecture

Question

Im a little confuse about Django responsibility architecture.

In my project, i chose work with CBV and built-in urls. In my studies, i understood that the responsibilities are divided into: Model, View, Template where:

Model takes care data and DataBase, from docs : "definitive source of information about your data. It contains the essential fields and behaviors of the data you’re storing"

View takes care about request and response

Template is a hight level layer app to show data

correct me if not that.

Most of my questions are where to put the codes, eg:

In my models i use something like:

class Product(models.Model):
    ..."""other fields"""
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    product_title = models.CharField(max_length=255, default='product_title')  
    product_title_seo = models.CharField(max_length=255, default='product_title_seo')    
    slug = models.SlugField(max_length=250,unique=True,null=True)

    def __str__(self):
        return self.product_title
    
    def get_absolute_url(self):
        return reverse('product_change', kwargs={'slug': self.slug, 'pk': self.pk})

    def save(self, *args, **kwargs): 
        self.product_title_seo = slugify(self.product_goal + " " + self.product_type + " " + self.product_district)
        self.product_title = slugify(self.product_title)
        if not self.slug:
            self.slug = self.product_title_seo
        return super().save(*args, **kwargs)

So as we can see i have 3 methods inside my model class, but i need some treatment for the majority of fields which would represent a considerable increase in methods.

This approach is correct, a lot of methods in model class, if not how separate and where put that methods?