Django Python: how do I implement my existing code with a web code?

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Python

CSS3

HTML5

Django

I am working on a Social Media Website, the base code is from an Open Source Project on GitHub.
On the base project you can only post text.

I was looking around the Internet and found a instruction to implement img upload.

But it doesn't work, because i get a lot of error codes.

Error Code:

AttributeError: module 'django.forms' has no attribute 'Post'

my Code:
forms.py

from django import forms
    from django.forms import fields
    from .models import Post, Comment

    class Post(forms.Post): 
      
        class Meta: 
            model = Post
            fields = ['name', 'Main_Img']

posts.py

    """ Home page with all posts """
    def first(request):
        context = {
            'posts':Post.objects.all()
        }
        return render(request, 'blog/first.html', context)
    
    """ Posts of following user profiles """
    @login_required
    def posts_of_following_profiles(request):
    
        profile = Profile.objects.get(user = request.user)
        users = [user for user in profile.following.all()]
        posts = []
        qs = None
        for u in users:
            p = Profile.objects.get(user=u)
            p_posts = p.user.post_set.all()
            posts.append(p_posts)
        my_posts = profile.profile_posts()
        posts.append(my_posts)
        if len(posts)>0:
            qs = sorted(chain(*posts), reverse=True, key=lambda obj:obj.date_posted)
    
        paginator = Paginator(qs, 50)
        page = request.GET.get('page')
        try:
            posts_list = paginator.page(page)
        except PageNotAnInteger:
            posts_list = paginator.page(1)
        except EmptyPage:
            posts_list = paginator.page(paginator.num_pages)
      
        return render(request,'blog/feeds.html',{'profile':profile,'posts':posts_list})

urls.py

urlpatterns = [...]
    if settings.DEBUG:
     urlpatterns += static (settings.MEDIA_URL,
                                  document_root = settings.MEDIA_ROOT)

models.py

""" Post model """
    class Post(models.Model):
        title = models.CharField(max_length=150)
        content = RichTextField(blank=True, null=True)
        Main_Img = models.ImageField(upload_to='media/images/') 
        date_posted = models.DateTimeField(default=timezone.now)
        date_updated = models.DateTimeField(auto_now=True)
        author = models.ForeignKey(User, on_delete=models.CASCADE)
        likes = models.ManyToManyField(User, related_name="blogpost", blank=True)
        saves = models.ManyToManyField(User, related_name="blogsave", blank=True)
    
        def total_likes(self):
            return self.likes.count()
    
        def total_saves(self):
            return self.saves.count()
    
        def __str__(self):
            return self.title
    
        def get_absolute_url(self):
            return reverse('post-detail', kwargs={"pk":self.pk})

post_form.py

<div class="m-auto w-100 container">
        <div class="content-section">
            <form method = "post" enctype="multipart/form-data"> 
                {% csrf_token %} 
                {{ form.as_p }} 
                <button type="submit">Upload</button> 
            </form>
        </div>
        </div>

This is the Website i got the code for the Img Upload from:
https://de.acervolima.com/python-bilder-in-django-hochladen

I have issues to implement them booth.

My problem is to sync the code from the website to my already existing code.

What I have tried:

I tried a lot of YouTube Videos and it doesnt helped me very much, because I am not good at implement the code to my already existing code.