HTML and CSS

How to make a link open up in a new browser window/tab:

<a href="www.google.com" target="_blank">Click here!</a>

HTML5

<!DOCTYPE html>
<html lang="en">
    <head>
    	<meta charset="utf-8">
    	<title>My Page</title>
    </head>
    <body>Hello World!</body>
</html>

How to include an external CSS stylesheet:

<link href="site.css" rel="stylesheet" type="text/css" />

How to build a menu from css:

CSS reference