Unfortunately, the Selenium site itself does not provide much educational material.
Judging from your blog, you are more interested in Selenium as a Java API than as a capture/playback tool. I think that is the right choice, but it does require some programming skills. Your blog has articles on elementary Java programming, e.g. "Branching Statements in Java for Selenium Automation". I do not know whether that means you are new to Java as well. I will assume that you are.
I think there are three or four areas you need to study to be effective at writing Selenium automation: the Java language, HTML, XPath, and Javascript. If you are comfortable with all of those, you will be comfortable with Selenium too. You do not need to be an expert, but you need to know enough that you know where to look for answers and feel confident that you can figure things out. You may have better luck finding well-written reference materials for those areas than finding an advanced-level Selenium book.
Some people seem to like using "page objects" in their Selenium automation. I am not one of those people, but a Google seach should turn up plenty of references.