まず17行目の path関数とinclude関数 のインポートですが、from django.urls import path, include ←この英文をそのまま日本語に訳すと理解しやすいので、僕なりに訳すと 『django.urlsからpath関数とinclude関数を使えるように、このファイル（urls.py）にインポート（輸入）してくれ』 ということです。

If you're a big fan of class based views in Django or you want to import views from one module to another module's urls.py you might often find your urls.py starting to look a little cluttered.

/home/jza/.virtualenvs/ardorforum/local/lib/python2.7/site-packages/django_markdown/urls.py:8: RemovedInDjango110Warning: django.conf.urls.patterns() is deprecated ...

Django is a popular web framework that helps developers build efficient and powerful web applications. Used by many renowned firms including Google, Instagram, and Youtube, it is one of the most ...