Make sure you use HTML, HEAD and BODY Tags properly. Invalid HTML coding can certainly cause ranking problems. Once you have finished your website run an HTML Validation program, a free service that checks Web documents in formats like HTML and XHTML for conformance to W3C Recommendations and other standards and will assist you identifying html errors.

In general search engines have a hard time indexing websites using Frames, Flash, Dynamic URLs or Image Maps. Search engines can't handle frames very well, some engines can't get through to the content of the website when frames are being used.

The same applies to Dynamic URLs. Most search engines cannot or will not list any dynamic URLs. Dynamic URLs are pages pulled from a database and are created when requested. A dynamic page looks like this: http://www.agnitionetworks.com/results.asp?q=dynamic+url. If your website

Search engines also can't index pages made entirely out of Flash and can't spider hyperlinks made of flash either.

If your site uses Frames, Flash, Javascript, Image Maps, or Dynamic URLs, it will be more difficult for the search engines to list your web pages no matter how well you optimize and submit them and you will have to put in quite a bit of work to work around those problems. If you can try to avoide those things when building your website.