Search engine optimization (SEO) is the process of affecting the visibility of a website or a web page in a search engine's unpaid results - often referred to as "natural," "organic," or "earned" results. In general, the earlier (or higher ranked on the search results page), and more frequently a site appears in the search results list, the more visitors it will receive from the search engine's users. SEO may target different kinds of search, including image search, local search, video search, academic search, news search and industry-specific vertical search engines.
Create unique, accurate page titles
Make use of the "description" meta tag, use favicon and apple touch icons, use relevant aliases.
Improving Site Structure
Improve the structure of your URLs
Make your site easier to navigate.
Easier structure, easier and much user friendly menus, using breadcrumbs.
Offer quality content and services.
Write better anchor text. Optimize your use of images. Use heading tags appropriately.
Dealing with Crawlers
Make effective use of robots.txt, .htaccess.
Be aware of rel="nofollow" for links.
SEO for Mobile Phones
Notify Google of mobile sites.
Guide mobile users accurately.
Promotions and Analysis
Promote your website in the right ways. Make use of free webmaster tools.