During this Google Webmaster Central hangout, John Mueller discussed a wide range of topics related to SEO and Google search. Among some of the main takeaways, Mueller advised website owners to focus on fixing mobile usability issues rather than worrying about when mobile usability will kick in. He also stressed that users will continue to use smartphones and demand great mobile experiences from websites. Mueller also discussed the benefits of using structured data and the fact that structured data may not necessarily affect a site's ranking. Additionally, he provided guidance on using canonical URLs and leveraging disavow files. Finally, Mueller touched on the importance of content positioning on web pages and treating top-level domains as unique entities.