What about mobile design?
That is a bigger question than it looks! Soon more people will be accessing web sites and apps on mobile devices than on desktop computers. So at a minimum, your site needs to be responsive or run a mobilizing plugin. However, some businesses and sites will benefit from a mobile-first strategy or even a separate mobile site and a responsive wordpress site.
All of this depends on your target market or audience, your goals, and your appetite for managing separate strategies, and we will establish these in the discovery process.