How the Internet Works
Most people take the internet for granted, without any insight to how it works or connected. First let's setup some definitions. The Internet and the World Wide Web (www) are often used to refer to the same thing. This is wrong. The internet is not the same as the world wide web. The Internet is a network of networks. The world wide web is a set of hyper linked text document, it's what you see in you web browser when you open a page that links to another page.
The World Wide Web Consortium (W3C) is an organization that keeps some order in all the chaos that might happen online if we didn't have some common census. Think of W3C as the manual of the internet, where you can find definitions and explanations for almost any term you will learn in any paid or free design course. Take some time to visit the website are read the documentation, get a feel for what you need to know.