I created a11 min screencast about WSGI titled:
[All You Need to Know about WSGI](https://django-lessons.com)
It is a PRO lesson, but it is free for now (you need to sign in to watch it). In that lesson I explain in very simple terms about HTTP, what is CGI, how WSGI extends CGI, why you need nginx + Gunicorn/uWSGI, and what is Apache's mod\_wsgi.
I would love to hear your feedback!