Fixed extends base.html for forum templates.

widget_gitgud/Forum/templates/Forum/forum.html

+{% extends 'base.html' %}
+{% load static %} 
+
+{% block title %}Widget's Forum{% endblock %}
+
+{% block styles %}
+    <style>
+        body {
+            background-color: rgb(253, 222, 207);
+            font-family: Georgia, serif;
+            font-size: 16px;
+            color: rgb(206, 132, 100);
+        }
+
+    </style>
+{% endblock %}
+
+{% block content %}
+<div style="text-align: center;">
+    <h1>Welcome to Widget's Forum</h1>
+</div>
+
+<p1>Forum posts:</p1>
+
+{% for post in posts %}
+    <li><a href="{% url 'Forum:forumpost-details' pk=post.pk %}">{{ post.title }} by {{ post.author }}</a></li>
+{% endfor %}
+<br>
+
+<button type="submit">
+    <a href="{% url 'Forum:forumpost-add' %}">New Post</a>
+</button>
+
+<br>
+<br> 
+<a href="http://127.0.0.1:8000/Dashboard/dashboard">Dashboard</a>
+<br>
+<a href="http://127.0.0.1:8000/Announcements/announcements">Announcements</a>
+<br>
+<a href="http://127.0.0.1:8000/Assignments/assignments">Assignments</a>
+<br>
+<a href="http://127.0.0.1:8000/widgetcalendar/calendar">Calendar</a>
+
+{% endblock %}
\ No newline at end of file

widget_gitgud/Forum/templates/forum.html

+{% extends 'base.html' %}
+{% load static %} 
+
 <title>{% block title %}Widget's Forum{% endblock %}</title>
 
 {% block styles %}

widget_gitgud/Forum/templates/forumpost-add.html

-<title>{% block title %} Add Post {% endblock %}</title>
+{% extends 'base.html' %}
+{% load static %} 
+
+{% block title %} Add Post {% endblock %}
 
 {% block styles %}
   <style>

widget_gitgud/Forum/templates/forumpost-details.html

-<title>{% block title %} {{object.title}} {% endblock %}</title>
+{% extends 'base.html' %}
+{% load static %} 
+
+{% block title %} {{object.title}} {% endblock %}
 
 {% block styles %}
   <style>

widget_gitgud/Forum/templates/forumpost-edit.html

-<title>{% block title %} Edit Post {% endblock %}</title>
+{% extends 'base.html' %}
+{% load static %} 
 
+{% block title %} Edit Post {% endblock %}
 {% block styles %}
   <style>
     body {

widget_gitgud/widget_gitgud/settings.py

@@ -62,7 +62,6 @@ TEMPLATES = [
     {
         'BACKEND': 'django.template.backends.django.DjangoTemplates',
         'DIRS': [os.path.join(BASE_DIR, 'template')],
-        'DIRS': [],
         'APP_DIRS': True,
         'OPTIONS': {
             'context_processors': [