Search Engine Optimisation (SEO) is never a completely sure thing. If a company claims that it can guarantee to get you to the top spot in the Search Engine Results Pages (SERPs) for any given keyword, you should run a mile: they’re blowing smoke.
While this is true, however, what is also true is that some methods are more successful than others. And some are more of a ‘sure thing’ than others. And in that regard, the SEO strategy that is perhaps the closest thing there is to a guaranteed route to success … is split testing.