Here is an example of the different sizes:
You've probally noticed that I've made the opening tag all capitals and the closing tag all lower case. HTML doesn't care what case your tags are in. As a result you should create a standard for yourself that will allow you to quickly identify a tag and how it will format the information that it effects. Many people prefer to use all caps so that their tags will stand out from the content of their page. I prefer making the opening tags caps and the closing tags lower case so that I can also see where the tag ends as well as where it begins. For me all upper case makes it harder to tell the opening tags from the beginning. Decide for yourself what works best. This is a case of webmaster's preference.
Goto the next section, and we will tell you how to format the text of your content.