Search Engine Optimization is beyond the scope of a theme, but our themes do use semantic HTML5 markup with search engines in mind. The reason we say SEO is beyond the scope of a theme is because themes are for presentation of content while SEO involves the content itself.
We recommend the free Yoast SEO plugin to assist you with search engine optimization. Even this excellent plugin is not a complete solution for SEO. You will need to learn SEO strategy. To begin with that, give The Beginner’s Guide to SEO a read. Also see Brian Jackson’s WordPress SEO Checklist.