Building a great website is not all. In order to achieve higher visibility in Google, it has to be updated and maintained regularly as per set of Webmaster Guidelines. Google Webmaster is a tool that you will need here. It is a free of charge tool provided by Google that gives you at a glance data about all important SEO aspects of a site, such as keywords, internal links, external links, search query, crawl errors, geographical language tag etc.
Overall, we can say that it is a centralized tech-support for search marketers and developers to eliminate all errors related to content, quality, technical structure guidelines.