Titles
These are really important. The title doesn't appear on the page but instead appears in the top of the browser window amongst other places including tabs, browsing history and Google search results. On the internet It's the only way to identify a page before visiting it. Because it doesn't appear on the page itself it is included in the Head section:
<head> <title>Introduction – Build This Site: HTML and CSS for beginners</title> <link href="screen.css" rel="stylesheet" type="text/css" /> </head>
All Titles should be unique to help navigating the site. Choose your own convention and then stick to it throughout the site. I choose to list the page name followed by a hyphen and then the site name, then maybe a strapline.