Search engines use complicated secret formulas to determine the website's rank on their lists. It's called ranking algorithms. Because of the true algorithm is hidden, then many SEO experts keep discussing about what is works and what's important to affect website's rank in search engines. I've summarized what I believe to be the best advice in 6 points.
HTML page title. This is the most important factor in search engine ranking algorithms. Your page title should be relevance with the content, and put your targeted keyword there. Optimizing your page titles is one of those activities that will quickly affect the way your listing look in the search engines. Visible HTML text on the page should contain the keyword. SEO pros insist that you need 250 or 1000 words on a page and that 5 to 10 percent of these words must be your target keywords. This percentage is called keyword density. You should use as many keywords and write your content clearly and make sense for the readers.
Inbound links, both the quantity of the links and the quality of the website linking to you. They indicate a page's quality, popularity, or status on the web. Links with the most quality power to boost rank are links from home page and links from authority pages in the community, meaning pages with collection of supported links from other websites covering the same topic.
Inbound link anchor text also can boost your page's ranks. Anchor text, is the text that is clickable on the web. It is an important factor in search ranking algorithms. Combining this keyword-rich anchor text with relevant text can make a good effect. Age of domain is also used by search engines to determine websites rank. Older domain name will be easier to making their way up the ranks than newer ones.
Lesser factors is things like meta tags, image alt tags, page url, etc. also can influence your ranking. Probably hundreds and possibly even thousands of factors in its algorithm.
