Add more information to the README

README.md

@@ -33,3 +33,21 @@ Starting development server at http://127.0.0.1:8001/
 Quit the server with CONTROL-C.
 ```
 As you've guessed, you can access it at http://127.0.0.1:8001/
+
+## Troubleshooting
+Sometimes Django is difficult.
+
+> `django.db.utils.OperationalError: no such table: core_user`
+
+This means you haven't yet run the migrations. See above.
+
+### Updating the models
+If you make changes to the database models, you will need to create new migrations.
+Do this like so:
+```shell
+(env) $ python manage.py makemigrations
+```
+Afterwards, we can apply them as normal.
+```shell
+(env) $ python manage.py migrate
+```