Starting from the bottom of the pyramid of SEO workflow:
Accessible content – This is the basis for all SEO. Content should high quality, have spiderability and have few errors.
Keywords – Do your research and calculate ROI. Figure out which keywords to target.
Links – This includes link building, link focused content and link incentivising.
Social – Don’t just use social networking site. Also include linkbait and social features on your website that users engage with.