Search Engine Optimization (SEO) is a complex process. First, there are many big search engines and they tend to set the rules. Most of all Google, representing somewhere over 60% of all organic search world wide, is the prize to aspire for. If you are on the first page of Google’s search engine return pages then you are most likely on the first page of any of the other major search engines. This is not always the case but it holds true often enough to mean that shooing for Google first is not a bad approach.