SEO (Search Engine Optimization) is never a completely sure thing. If a company claims that it can guarantee to get you to the top spot in the SERPs (Search Engine Results Pages) 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.