Issue with adding new category models and searching posts using it

Good afternoon! I have django application, on main(index) page i have posts, and there is side bar on that sidebar i have code for showing and searching posts in concrete category, (i copied it from tutorial, and teacher didnt showed how to work with that), now there is only 1 category that work succesfully (named just as "category"), i must add 2 new categories model, with same functionality, but with other models (datepublication and univercity)

here is base html (sidebar with functionality here)

{% load static %}
{% load women_tags %}
<!DOCTYPE html>
<html>
<head>
    <title>{{title}}</title>
    <link type="text/css" href="{% static 'women/css/styles.css' %}" rel="stylesheet" />
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <link rel="shortcut icon" href="{% static 'women/images/main.ico' %}" type="image/x-icon"/>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<table class="table-page" border=0 cellpadding="0" cellspacing="0">
<tr><td valign=top>
{% block mainmenu %}
        <div class="header">
            <ul id="mainmenu" class="mainmenu">
            <li class="logo"><a href="{% url 'home' %}"><div class="logo"></div></a></li>
{% for m in menu %}
            <li><a href="{% url m.url_name %}">{{m.title}}</a></li>
{% endfor %}
                {% if request.user.is_authenticated %}
                <li class="last"> {{user.username}} | <a href="{% url 'logout' %}">Выйти</a></li>
                {% else %}
                <li class="last"><a href="{% url 'register' %}">Регистрация</a> | <a href="{% url 'login' %}">Войти</a></li>
                {% endif %}
            </ul>
            <div class="clear"></div>
        </div>
{% endblock mainmenu %}


<table class="table-content" border=0 cellpadding="0" cellspacing="0">
<tr>
<!-- Sidebar слева -->
<td valign="top" class="left-chapters">
    <ul id="leftchapters">
{% if cat_selected == 0 %}
        <li class="selected">Все категории</li>
{% else %}
        <li><a href="{% url 'home' %}">Все категории</a></li>
{% endif %}

{% for c in cats %}
{% if c.women__count > 0 %}
    {% if c.pk == cat_selected %}
        <li class="selected">{{c.name}}</li>
    {% else %}
        <li><a href="{{ c.get_absolute_url }}">{{c.name}}</a></li>
    {% endif %}
{% endif %}
{% endfor %}

    </ul>
</td>
<!-- Конец Sidebar'а -->
<td valign="top" class="content">
    <!-- Хлебные крошки -->
    {% block breadcrumbs %}
    {% endblock %}

<!-- Блок контента -->
    <div class="content-text">
{% block content %}
{% endblock %}
{% if page_obj.has_other_pages %}
<nav class="list-pages">
    <ul>
{% if page_obj.has_previous %}
<li class="page-num">
    <a href="?page={{ page_obj.previous_page_number }}">&lt;</a>
</li>
{% endif %}

        {% for p in paginator.page_range %}
        {% if page_obj.number == p %}
        <li class="page-num page-num-selected">{{ p }}</li>
        {% elif p >= page_obj.number|add:-2 and p <= page_obj.number|add:2  %}
        <li class="page-num">
            <a href="?page={{ p }}">{{ p }}</a>
        </li>
        {% endif %}
        {% endfor %}

{% if page_obj.has_next %}
<li class="page-num">
    <a href="?page={{ page_obj.next_page_number }}">&gt;</a>
</li>
{% endif %}

    </ul>
</nav>
{% endif %}
    </div>
<!-- Конец блока контента -->

</td></tr></table>
</td></tr>
<!-- Footer -->
<tr><td valign=top>
    <div id="footer">
        <p>&copy;    </p>
    </div>
</td></tr></table>
<!-- Конец footer'а и страницы -->
</body>
</html>

here is index html

{% extends 'women/base.html' %}

{% block content %}
<ul class="list-articles">
    {% for p in posts %}
        <li>
            <div class="article-panel">
                <p class="first">Категория: {{p.cat}}</p>
                <p class="last">Дата: {{p.time_update|date:"d-m-Y H:i:s"}}</p>
            </div>
            <div class="article-panel">
                <p class="first">Университет: {{p.univercity}}</p>

            </div>
            <h2>{{p.title}}</h2>
            {% autoescape on %}
                {{p.content|linebreaks|truncatewords:50}}
            {% endautoescape %}
            <div class="clear"></div>
            <p class="link-read-post"><a href="{{ p.get_absolute_url }}">Читать пост</a></p>
        </li>
    {% endfor %}
</ul>
{% endblock %}

here is models py (univercity and Yearp is copies of Category)

from django.db import models
from django.urls import reverse
from django.contrib.auth.models import User


class Women(models.Model):
    id = models.AutoField(primary_key=True)
    title = models.CharField(max_length=255, verbose_name="Название объявления")
    content = models.TextField(blank=True, verbose_name="Текст объявления")
    contact = models.CharField(max_length=255, verbose_name="Контакты для связи)")
    time_create = models.DateTimeField(auto_now_add=True, verbose_name="Время создания")
    cat = models.ForeignKey('Category', on_delete=models.PROTECT, verbose_name="Категории")
    university = models.ForeignKey('University', on_delete=models.PROTECT, verbose_name="Университет")
    yearp = models.ForeignKey('Yearp', on_delete=models.PROTECT, verbose_name="Год публикации")
    author = models.ForeignKey(User, on_delete=models.CASCADE)


    def __str__(self):
        return self.title


    class Meta:
        verbose_name = 'Обьявления'
        verbose_name_plural = 'Обьявления'
        ordering = ['id']

    def get_absolute_url(self):
        return reverse('post', args=(str(self.id)))
#####################################################################

class Category(models.Model):
    name = models.CharField(max_length=100, db_index=True, verbose_name="Категория")
    slug = models.SlugField(max_length=255, unique=True, db_index=True, verbose_name="URL")

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse('category', kwargs={'cat_slug': self.slug})

    class Meta:
        verbose_name = 'Категория'
        verbose_name_plural = 'Категории'
        ordering = ['id']
####################################################################

class University(models.Model):
    name = models.CharField(max_length=100, db_index=True, verbose_name="Университет")
    slug = models.SlugField(max_length=255, unique=True, db_index=True, verbose_name="URL")

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse('university', kwargs={'university_slug': self.slug})

    class Meta:
        verbose_name = 'Университет'
        verbose_name_plural = 'Университет'
        ordering = ['id']

class Yearp(models.Model):
    name = models.CharField(max_length=100, db_index=True, verbose_name="Год публикации")
    slug = models.SlugField(max_length=255, unique=True, db_index=True, verbose_name="URL")

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse('yearp', kwargs={'yearp_slug': self.slug})

    class Meta:
        verbose_name = 'Год публикации'
        verbose_name_plural = 'Год публикации'
        ordering = ['id']

here is urls

urlpatterns = [
    path('', WomenHome.as_view(), name='home'),
    path('personal', PersonalPage.as_view(), name='personal'),
    path('about/', about, name='about'),
    path('addpage/', AddPostView.as_view(), name='add_page'),
    path('contact/', ContactFormView.as_view(), name='contact'),
    path('login/', LoginUser.as_view(), name='login'),
    path('logout/', logout_user, name='logout'),
    path('register/', RegisterUser.as_view(), name='register'),
    path('post/<int:pk>/', ShowPost.as_view(), name='post'),
    path('category/<slug:cat_slug>/', WomenCategory.as_view(), name='category'),

]

here is list_categories.html

{% for c in cats %}
    {% if c.pk == cat_selected %}
        <li class="selected">{{c.name}}</li>
    {% else %}
        <li><a href="{{ c.get_absolute_url }}">{{c.name}}</a></li>
    {% endif %}
{% endfor %}

I tried just to copy all that fields, but when i finished, it did not work I will be really thankful to someone who can help with it

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