The important stuff: title tag, h1 tag, meta description, navigation link text, image alt tag, and good copy-writing. See Julien Smith’s blog post about Twitter headlines. And, as Gary Vaynerchuk says, content is king – so write good stuff that people will want to share with their Twitter and Facebook friends.
WordPress SEO by Yoast
WordPress SEO is the most complete SEO plugin that exists today for WordPress.org users. It incorporates everything from a snippet preview that helps you optimize your page titles, meta descriptions and keywords to XML sitemaps, and loads of optimization options in between.
