One element that you will end up using a lot is the <ul> tag: the unordered list. By default, every item in the list will be shown with a round bullet in front of the text. With CSS, you can change the style of your list.
Using this property, you can change the shape of the bullet. Some of the values you can use are: none (no bullet at all), square (a square), circle (a small circle), or disc (the default).
You can provide your own image for the bullet by using the list-style-image property. The default value is none, which means that the bullet image is determined by the value of list-style-type. However if you specify url, followed by a path to an image, that image will be used instead, for example:
url('smiley.gif')