5 Important google SEO factors - Webfactory

Inward Links
Google counts inward links to your website and classes them as votes. It then takes the number of links in to your site from the number of links you have on your site to another site. This leaves you with a net score.

There is additional complexity as the vote you receive or vote you cast is not worth the same in all cases. Google takes the net score of your site to weight the votes you cast and takes the net score of the site linking to you to weight the vote passed to you. What does this mean? A site like BBC News where there are many more votes for the site than it casts for other sites will be worth a lot. You should try to get votes/links from sites who themselves have a large number of votes

HTML Structure
In the past HTML was such that Google could read your text but couldn’t infer anything about the relative importance of different elements. We build all our websites using well structured HTML so Google knows which bits of the content it should pay great attention to and which it should consider less important.

Content
I don’t care what anyone says, content is still king. Google will always look at the content on your site to determine what your site is about. Of course it is not the only factor but invariably we have found content changes will always have an impact on ranking. Google doesn't like content overloaded with keyword repetition, but correctly done, content can make a big difference.

Domain Age
Just like in the real world, companies which have been around for a long time tend to be businesses which are doing well. Google uses the domain name age as a proxy for the age of your website. If your domain name is old then Google will up you in the credibility stakes, on the other hand, a brand new domain looks like the new kid on the block and since more businesses fail in their first year, Google seems to strike a note of caution.

Domain Keywords
Having your keywords in your domain name can help with your ranking. Essentially Google trusts things which you find hard to change more than it trusts things you can change really easily. Since changing a domain name is like changing your mobile number, Google pays attention to the terms you have decided to have as your domain name.