Instead of using 'font' tags for each paragraph and cluttering your HTML code with endless font tags you can simply make a style with the a specified font type, size and color and use it throughout the site. Styles can be used in tables, rows, and cells. Styles can also be used for form objects. The possibilities are endless when you use style sheets.
For on-line tutorials go to:
http://www.smartwebby.com/web_site_design/css_styles_tutorial.asp