Getting posts of a category in blog application

I want to grab all the posts of a particular category. I am passing th url like this: {% url 'blog:post_list' %}?category={{ cat }}. But I am not able how to return the queryset for posts of the category cat passed in the url.

my Post model:

class Post(models.Model):
    title = models.CharField(max_length=100, unique = True)
    overview = RichTextUploadingField()
    created_at = models.DateTimeField(editable=False)
    published_at = models.DateTimeField( null=True)
    updated_at = models.DateTimeField()
    content = RichTextUploadingField(blank=False, null=True)
    # comment_count = models.IntegerField(default = 0)
    # view_count = models.IntegerField(default = 0)
    author = models.ForeignKey(User, on_delete=models.CASCADE, related_name='posts')
    thumbnail = ImageField(blank=True, null=True)
    categories = models.ManyToManyField(Category, related_name='posts')
    featured = models.BooleanField(blank=True, default=False)
    slug = models.SlugField(max_length = 250, null = True, blank = True, unique = True)

            <h1 class="mb-4">{{post.title|safe}}</h1>

            {% for cat in post.categories.all %}

            <a class="category mb-5" href="{% url 'blog:post_list' %}?category={{ cat }}">{{cat}}</a>

            {% endfor %}

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