This one is sometimes strange, but don't think it too hard.
<a href="http://www.com/">LINK</a>
EVERYTHING between the two is clickable so be careful. You can make it one word, one sentence, a whole paragraph and even an image that can be clicked to go to another page. It can also be set up to open a separate tab.
<a href="http://fubar.com/home.php">Go to Fubar Home Page</a>
To make an image clickable, add the <img src=""> tag
<a href="http://fubar.com/home.php"><img src="http://fubar.com/imgs/logo_bubbles_2.gif"></a>
Clicking this will open Fubar in this tab.
To make clicking open a new tab, add target="_blank"
<a href="http://fubar.com/home.php" target="_blank"><img src="http://fubar.com/imgs/logo_bubbles_2.gif"></a>