I saw a nice video today in MIX site this is about Search Engine Optimization. It’s a big video and I really learnt a lot about SEO after see that. You can also see that. Just download SEO video from here and enjoy.
I have written a brief on that video hope you can learn vey basic things from here too
Use HTML semantically
Good: <H1>this is an Article</H1>
Bad: <span class=”header1”> this is an Article</span>
So be careful to use of common tags its priority sequence is like that <a>, <h1>, <title>, <Meta>, <table>