Most of us know by now that having a website doesn't mean much if nobody knows about it. There are many ways to market your website online, including pay-per-click advertising and banner ads on other websites. But by far the most effective and comparatively speaking cheapest way of getting your website "out there" is to optimize the content so that search engines enjoy "crawling" your website and therefore rank your website highly compared to your competitors. A very quick crash-course in sea.