some changes

mysite/urls.py

@@ -15,8 +15,9 @@ Including another URLconf
     2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
 """
 from django.contrib import admin
-from django.urls import path
+from django.urls import include, path
 
 urlpatterns = [
+    path("polls/", include("polls.urls")),
     path("admin/", admin.site.urls),
 ]

polls/urls.py

@@ -0,0 +1,7 @@
+from django.urls import path
+
+from . import views
+
+urlpatterns = [
+    path("", views.index, name="index"),
+]

polls/views.py

@@ -1,3 +1,5 @@
 from django.shortcuts import render
+from django.http import HttpResponse
 
-# Create your views here.
+def index(request):
+    return HttpResponse("Hello, world. You're at the polls index.")