As Google experiments with a mobile first index, what does it mean for SEO?

As Google experiments with a mobile first index, what does it mean for SEO? Although mobile first indexing is at an early stage – with Google itself admitting there are still many challenges to overcome – it no doubt signals an important shift that website design and SEO will have to respond to. Source: Hotel Marketing As Google experiments with a mobile first index, what does it mean for SEO?