Today's lesson covered a great deal of ground, and wrapped up the HTML and site-management tools available in Dreamweaver MX. You should now have the background necessary to create and upload Web sites to remote servers.
You've learned about advanced objects like layers, style sheets, and frames. Although tempting to use, these are some of the more "peculiar" elements that might not render correctly depending on the browsers being used by your target audience. Some alternative browser's are making headway (such as Opera and Mozilla), so don't assume that everyone will always be able to see your pages in the same way.