In the world of seo, content rules the web. The more pages and different content your site has related to a common subject the better the chance a search engine will list it. Search engines want to provide the best sites related to the keyword searched. So if your site has 5 pages and minimal content, and another has 15 pages and lots of content, which site would you rather find in the top ranks while doing a keyword search?

The web is all about linked content and information. If your site doesn't link out to similar content you are like a broken link of a chain, or dead end. Likewise and more importantly, if no web sites link to you, your site appears to not be a relevant resource to search engines. Links to your web site are important, but they should be from high ranked web sites with relevant content to yours.

Page Titles:

Page Titles play a key role in seo (search engine optimization) success. Every page of your web site has (or should have) different content and thus the Page Title for each page should be based on said pages content. It's more involved than this, just remember page titles are important.