First plugin off the Rank will be WordPress SEO by Yoast, this is a simple to use plugin to subtly enhance with search engine optimizations. It gives a quick SEO analysis of pages and posts based on a defined keyword and provides a visual indicator as to the effectiveness of the page content to support that.
Once installed and activated the plugin adds a new “SEO” menu section to the WordPress administration menu on the left hand side. This gives access to all the configuration options for the plugin such as Social Media configuration for Facebook and Twitter, XML sitemaps and a whole heap of other functionality. Pages and options are all laid out cleanly with good explanations and for the complete novice there is a simple tour which gives an overview of all the available functions.
Quick and simple to set up I would recommend it for all WordPress sites, the plugin is free to use but if you do find it useful I would suggest stumping up a few bucks for the developer for keeping the SEO plugin up to date at the very least rate the plugin so others can see it’s value. See the details at either WordPress:
Or the developers website:
While you are there check out the Google Analytics plugin, if you’re not using Analytics why not?!