How to extend a User's profile to save data in Django

I'm new to Django and I'm attempting to build a website where a user can view a DB of books and related authors and add any book to their 'favourites'. I've been searching lots and I can't find a satisfactory way of doing this - or indeed of saving any user data other than customising fields when you create a user.

My current idea is to extend the UserModel to add an extra field which links their favourite book to the user. Tips on UserModel found here

I can now see the UserProfile with some favourites by logging in to the Admin account, but I cannot link the View class/function with my bookfavs.html for the User to see their favourited books. The bookfavs.html states the username but not favourites.

readable_project app_name = bookshelf

#Models.py
class UserProfile(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    favorites = models.ManyToManyField(Book, related_name='favourites')

class Author(models.Model):
    first_name=models.CharField(max_length=30)
    last_name=models.CharField(max_length=30)
    dob = models.DateField()
    bio = models.CharField(max_length=300)
    
    def __str__(self):
        return self.first_name + " " + self.last_name

    def get_absolute_url(self):
            return reverse('authorlist')

class Book(models.Model):
    id = models.AutoField(primary_key=True)
    users = models.ManyToManyField(User)
    title = models.CharField(max_length=50)
    num_page = models.IntegerField()
    date_pub = models.DateField()
    tags = models.CharField(max_length=200)
    blurb = models.CharField(max_length=300)

    def get_absolute_url(self):
            return reverse('')`


#views.py
#Add favourite button...?
def favorite(request, pk):
    if request.method == 'POST':
        favorite = Book.objects.get(pk=pk)
        user = request.user
        user.favorites.add(favorite)
        messages.add_message(request, messages.INFO, 'Book Favorited.')
        return redirect('home')


#List ALL books
class BookList(ListView):
    model = Book
    template_name='bookshelf/booklist.html'

#List favourite books
class BookFavs(TemplateView):
    model = UserProfile
    template_name = 'bookshelf/bookfavs.html'
    def get_context_data(self,*args, **kwargs):
        context = super(BookFavs, self).get_context_data(*args,**kwargs)
        context['users'] = UserProfile.objects.all()
        return context

#bookfavs.html
{% if user.username %} 
<h4 class="header-greet">Welcome {{ user.username }} to your books!</h4> 
{% endif %}

{% if user.is_authenticated %}
    {% with userprofile.favorites.all as favourite_books %}
      {% for book in book_list %}
        {% if book in favorite_book %}
        <p>{{ book.title }}</p>
        {% endif %}
      {% endfor %}
    {% endwith %}
{% endif %}

# List favorite books
class BookFavs(TemplateView):
    template_name = 'bookshelf/bookfavs.html'

    def get_context_data(self, *args, **kwargs):
        context = super().get_context_data(*args, **kwargs)

        # access the current user's profile and their favorite books

        if self.request.user.is_authenticated:
            user_profile = self.request.user.userprofile
            context['favorite_books'] = user_profile.favorites.all()
        return context

{% if user.is_authenticated %}
  <h4>Welcome {{ user.username }}! Here are your favorited books:</h4>

  <ul>
    {% for book in favorite_books %}
      <li>{{ book.title }}</li>
    {% empty %}
      <p>You have no favorite books yet.</p>
    {% endfor %}
  </ul>
{% else %}
  <p>Please log in to view your favorite books.</p>
{% endif %}