Most documents have some type of text structure that aids in the reading of the text. This about a book, for example. When you pick up a book, you can tell immediately that chapter titles will be in a specific size and type of font throughout. Depending on the book, different types of text might mean different things -- italicized text may mean there's a quote you should pay special attention to, whereas bold, left-aligned text may identify sections and help you see quickly what the text following will be able.
This is all text structure, and just about every document has some kind of structure, even if it's not a good one. For it's part, Google Page Creator gives you some textual structure controls to help you create -- and readers to read -- the text for your site.
These controls are used for functions such as creating a heading, subheading, or minor heading, or for switching back to normal text after creating one of those other elements.
How you use the controls is entirely up to you. But remember that when creating a web site you should keep the end user in mind. Design your site in such a way that it's easy to read and is consistent throughout. You might want to take some time to surf around the Net and look at how sites similar to yours are designed.
Text can be an interesting and evena vital part of your web site. Keep in mind that some fonts are easier to read than others. The designers who created Google Page Creator templates have already set up a textual structure for you. Unless you really hate it, don't change it except to add things such as headings and subheadings to the text.
[This article is excerpted from Google Powered: Productivity with Online Tools by Jerri L. Ledford (ISBN: 978-0470109656, Wiley, Jan. 2007).]