This course will become read-only in the near future. Tell us at community.p2pu.org if that is a problem.
The Web would not be a web without the connections that run from one page to another: the hyperlinks. You will now create your first hyperlink. To do that you have to decide two things first:
To answer the second question you need the Address of the Webpage. This Address is called a URL ("Uniform Resource Locator"). Just browse to the webpage you want, and copy the URL from the browsers address bar.
Here's an example:
To do this, first type in the text
The Web was invented by Tim Berners-Lee
Then add the A-Tag around the Link-Text
The Web was invented by <a>Tim Berners-Lee</a>
And finally, add the URL like so:
The Web was invented by <a href="http://en.wikipedia.org/wiki/Tim_Berners_Lee">Tim Berners-Lee</a>
Try it in your jsfiddle now!
p.s. Links only go in one direction: from your page to somewhere else. To create a link from the another page that points back to your page you would have to edit the other page ... if you have permission / ability to do so.