A few questions regarding ranking!
 

I was wondering whats the difference between the PR rankings. Also, what about SEO? Can you tell me a little bite about SEO ranking? How do you figure out ranking and which one can you trust?

Can someone tell me my ranking?

Not if you don't tell us what your URL is. But you can check your own page rank by going to http://checkpagerank.net

SEO stands for Search engine optimization and that simply means you design your web page in a way that it will help you get a higher listing for your desired keywords on search engines like Google.

For example, let us say you want to be the #1 listing on Google whenever anyone searches for Hot Naked Blondes. You would then design your page around the phrase Hot Naked Blondes, putting it in your meta tags, title tag, alt on your images and so on.

Page rank comes in when two websites both have pretty much the same score for the phrase Hot Naked Blondes and Google doesn't know who to put first and who to put second so it then considers Page Rank and the person with the best page rank typically gets the higher spot.

However do keep in mind that this was just a simplified answer. Google takes into account many things such as the age of the domain, meta tags, word weight, page rank and so on and so on.

To learn more about SEO for your web page I would just google SEO.