Created the templates for all the required urls

ejmejilla_reading/bookshelf/models.py

 from django.db import models
+from django.urls import reverse
 
 class Author(models.Model):
     first_name = models.CharField(max_length=200, blank=True)
@@ -10,6 +11,9 @@ class Author(models.Model):
     def __str__(self):
         return f"{self.first_name} {self.last_name}"
 
+    def get_absolute_url(self):
+        return reverse('bookshelf:author-details', kwargs={'pk': self.pk})
+
 
 class Books(models.Model):
     title = models.CharField(max_length=200, blank=True)
@@ -18,3 +22,9 @@ class Books(models.Model):
     year_published = models.IntegerField(default=0)
     ISBN = models.IntegerField(default=0)
     blurb = models.TextField(max_length=1000, blank=True)
+
+    def __str__(self):
+        return self.title
+
+    def get_absolute_url(self):
+        return reverse('bookshelf:book-details', kwargs={'pk': self.pk})

ejmejilla_reading/bookshelf/templates/bookshelf/author_details.html

+{% extends 'base.html' %}
+{% load static %}
+{% block title %} {{ object.first_name }} {{object.last_name}} {% endblock %}
+{% block content %}
+
+<div class="details">
+  <h1> {{ object.first_name }} {{object.last_name}} </h1>
+  <ul>
+    <li>{{ object.age }}</li>
+    <li>{{ object.nationality }}</li>
+    <li>{{ object.bio }}</li>
+  </ul>
+</div>
+
+<div class="details">
+  <h2>Books by {{object.first_name}} {{object.last_name}} I love:</h2>
+  <ul>
+    {% for books in author.books_set.all %}
+     <li>
+        <a href="{{books.get_absolute_url}}">
+          {{ books.title }}
+        </a>
+      </li>
+    {% endfor %}
+  </ul>
+</div>
+
+<ul class="footer">
+  <li><a href="{% url 'bookshelf:home' %}">Home</a></li>
+  <li><a href="{% url 'bookshelf:authors' %}">Authors</a></li>
+  <li><a href="{% url 'bookshelf:books' %}">Books</a></li>
+</ul>
+{% endblock %}

ejmejilla_reading/bookshelf/templates/bookshelf/authors.html

+{% extends 'base.html' %}
+{% load static %}
+{% block title %} My Favorite Authors {% endblock %}
+{% block content %}
+<h1>EJ's Favorite Authors:</h1>
+<ul class="list">
+    {% for object in object_list %}
+    <li>
+        <a href="{{object.get_absolute_url}}">
+          {{object.first_name}} {{object.last_name}}
+        </a>
+    </li>
+    {% endfor %}
+</ul>
+<ul class="footer">
+    <li><a href="{% url 'bookshelf:home' %}">Home</a></li>
+    <li><a href="{% url 'bookshelf:books' %}">Books</a></li>
+</ul>
+{% endblock %}

ejmejilla_reading/bookshelf/templates/bookshelf/book_details.html

+{% extends 'base.html' %}
+{% load static %}
+{% block title %} {{ object.title }} {% endblock %}
+{% block content %}
+
+<div class="details">
+  <h1>{{ object.title }}</h1>
+  <ul>
+    <li><a href="{{ object.author.get_absolute_url }}">{{object.author}}</a></li>
+    <li>{{ object.publisher }}</li>
+    <li>{{ object.year_published }}</li>
+    <li>{{ object.ISBN }}</li>
+    <li>{{ object.blurb }}</li>
+  </ul>
+</div>
+
+<ul class="footer">
+  <li><a href="{% url 'bookshelf:home' %}">Home</a></li>
+  <li><a href="{% url 'bookshelf:authors' %}">Authors</a></li>
+  <li><a href="{% url 'bookshelf:books' %}">Books</a></li>
+</ul>
+{% endblock %}

ejmejilla_reading/bookshelf/templates/bookshelf/books.html

+{% extends 'base.html' %}
+{% load static %}
+{% block title %} My Favorite Books {% endblock %}
+{% block content %}
+<div class="list">
+  <h1>EJ's Favorite Books:</h1>
+  <ul>
+    {% for object in object_list %}
+      <li>
+        <a href="{{object.get_absolute_url}}">
+          {{object.title}}
+        </a>
+      </li>
+    {% endfor %}
+  </ul>
+</div>
+
+<ul class="footer">
+    <li><a href="{% url 'bookshelf:home' %}">Home</a></li>
+    <li><a href="{% url 'bookshelf:authors' %}">Authors</a></li>
+</ul>
+{% endblock %}

ejmejilla_reading/bookshelf/templates/bookshelf/home.html

+{% extends 'base.html' %}
+{% load static %}
+{% block title %} My Favorite Books & Authors {% endblock %}
+{% block content %}
+<div class="homepage">
+  <h1>Welcome to EJ's Database of Favorite Books and Authors!</h1>
+  <p>I like a variety of books from YA novels to psychological horror :D</p>
+</div>
+
+<ul class="footer">
+    <li><a href="{% url 'bookshelf:books' %}">Books</a></li>
+    <li><a href="{% url 'bookshelf:authors' %}">Authors</a></li>
+</ul>
+
+{% endblock %}

ejmejilla_reading/bookshelf/urls.py

 # bookshelf/urls.py
 from django.urls import path
-from .views import index
+from .views import home_view, BookDetailView, BookListView, AuthorDetailView, AuthorListView
 
 urlpatterns = [
-    path('', index, name='index'),
+    path('', home_view, name='home'),
+    path('books/', BookListView.as_view(template_name='bookshelf/books.html'), name='books'),
+    path('books/<int:pk>/details/', BookDetailView.as_view(template_name="bookshelf/book_details.html"), name='book-details'),
+    path('authors/', AuthorListView.as_view(template_name='bookshelf/authors.html'), name='authors'),
+    path('authors/<int:pk>/details/', AuthorDetailView.as_view(template_name='bookshelf/author_details.html'), name='author-details'),
 ]
 
 app_name = "bookshelf"

ejmejilla_reading/bookshelf/views.py

-# bookshelf/views.py
-from django.http import HttpResponse
+# appname/views.py
+from django.shortcuts import render
+from django.views import View
+from django.views.generic.detail import DetailView
+from django.views.generic.list import ListView
 
-def index(request):
-    return HttpResponse('Hello World! This came from the index view')
+from .models import Author, Books
+
+def home_view(request):
+    return render(request, 'bookshelf/home.html')
+
+
+class BookDetailView(DetailView):
+    model = Books
+
+
+class BookListView(ListView):
+    model = Books
+
+
+class AuthorDetailView(DetailView):
+    model = Author
+
+
+class AuthorListView(ListView):
+    model = Author

ejmejilla_reading/ejmejilla_reading/settings.py

@@ -57,7 +57,7 @@ ROOT_URLCONF = 'ejmejilla_reading.urls'
 TEMPLATES = [
     {
         'BACKEND': 'django.template.backends.django.DjangoTemplates',
-        'DIRS': [],
+        'DIRS': [os.path.join(BASE_DIR, 'templates')],
         'APP_DIRS': True,
         'OPTIONS': {
             'context_processors': [

ejmejilla_reading/ejmejilla_reading/urls.py

@@ -18,5 +18,5 @@ from django.urls import include, path
 
 urlpatterns = [
     path('admin/', admin.site.urls),
-    path('bookshelf/', include('bookshelf.urls', namespace="bookshelf"))
+    path('bookshelf/', include('bookshelf.urls')),
 ]

ejmejilla_reading/templates/base.html

+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <link rel="stylesheet" href="style.css">
+    <title>{% block title %}My amazing site{% endblock %}</title>
+    {% block styles %}{% endblock %}
+</head>
+<body>
+    <div id="content">
+        {% block content %}{% endblock %}
+    </div>
+    {% block scripts %}{% endblock %}
+</body>
+</html>