To make additional changes to the text, you can use the span tags. When you do so, you are entering CSS commands into a 'style' property. This is called "setting inline styles". This is not recommended. Rather, if you are setting the same properties for different elements several times, create a class, and assign the class to the span.

For instance, in the XHTML:

<span class='className'>XXXX</span>

In your CSS

.className {font-weight:bold;}

Please consult the CSS section for more information.

Another font tag is the "header" tag. These header tags are used to logically organize and breakup information into sections much like an outline. As such, these should not be used simply to size text. There are CSS rules for that. There should only be one <h1>, and an <h2> should be under a <h1> and so on. Each subsequent header tag is smaller than the one before it, as shown below:

You can see that there is a lot of additional formatting that can be done with the text!