Hello,
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CSS files have the extention.css and are linked to the page using the link tag found inside the tags of your HTML document.
For example, my site's style sheet may be called SiteStyles.css and it would be linked to as
<html> <head> <link rel="stylesheet" type="text/css" href="SiteStyles.css" /> </head> <body> Put my body here </body> </html>
In the style sheet itself you would have the CSS rules which contain the selector and the declaration. The sector is the HTML element or the ID / class. Don't worry about the the ID / class, we'll cover them later, for now, lets just work with HTML Tags.
Thanks