cat.html

{% extends 'base.html' %}
{% for cat in cat %}
<p>{{ cat.title }}</p>
{% endfor %}

models.py

class Category(models.Model):
    name = models.CharField(max_length=200)

    def __str__(self):
        return self.name
    # test


class Post(models.Model):
    author = models.ForeignKey('auth.User', on_delete=models.CASCADE)
    title = models.CharField(max_length=200)
    category = models.ForeignKey(Category)
    text = models.TextField()
    image = models.ImageField(upload_to='img')
    created_date = models.DateTimeField(
        default=timezone.now)
    published_date = models.DateTimeField(
        blank=True, null=True)

    def publish(self):
        self.published_date = timezone.now()
        self.save()

    def __str__(self):
        return self.title

views.py

def getcat(request, id):
    cat = Post.objects.filter(category=id)
    Categories = Category.objects.all()
    context = {
        'cat': cat,
        'category': Categories

    }
    return render(request, 'cat.html', context=context)