SEO is very easy in Google but as far as i think the reality is that we need to follow Google guideline and criteria for making our website Google friendly because Google is the most targeted search engine of maximum website owners who want traffic from Google search engine and Google wants to give complete ease to its user by providing perfect and user expected information. So, Google algorithmically gives priority to those websites which are best fitted to searcher's query and that's why website should be properly optimized in order to come up in Google SERP.