There are many ways to learn about the ever-changing SEO but here are two ways to do it. One is to buy the SEO Video & Book from Photographers-SEO.com and the other is to purchase Scribe SEO. Scribe is a Plugin for WordPress that not only helps you with the SEO of posts and pages but also instructs you on what to fix and why.
So give both a look. Photographers-SEO.com is a great blog and Scribe is an awesome plugin.