Before we will jump into building our first website in Python, we need to know how the Internet works. It's not as complicated as it seems.
I am not going into too much detail here and I avoid "well, actually's" - all the corner cases and exceptions that would only make the whole picture more complicated.
Please, note that this is an explanation for beginners. If you look for something highly technical you could always look at RFC 7230 (http://www.rfc-editor.org/info/rfc7230) ;).
I'm not a native English speaker, so bear with my broken English ;).
And if you could not wait to build something without waiting for the next episodes, jump to our lovely Django Girls tutorial: http://tutorial.djangogirls.org/
Happy coding!
Enjoy!