You can create a page that contains a predesigned CSS layout, or create a completely blank page and then create a layout of your own.
The predesigned CSS layouts provide the following types of columns:
Selecting one of the XHTML document type definitions from the DocType (DTD) menu makes your page XHTML-compliant. For example, you can make an HTML document XHTML-compliant by selecting XHTML 1.0 Transitional or XHTML 1.0 Strict from the menu. XHTML (Extensible Hypertext Markup Language) is a reformulation of HTML as an XML application. Generally, using XHTML gives you the benefits of XML, while ensuring the backward and future compatibility of your web documents.
It’s a good idea to save your file in a Dreamweaver site.Avoid using spaces and special characters in file and folder names, and do not begin a filename with a numeral. In particular, do not use special characters (such as é, ç, or ¥) or punctuation marks (such as colons, slashes, or periods) in the names of files you intend to put on a remote server; many servers change these characters during upload, which will cause any links to the files to break.