Google Analytics is an essential tool for your website. It shows you everything you need to know about your sites date. It has real wold results of every action you taken on your site.
Google Analytics allows you to track your progress and consistently strive to improve on it.
You can analyse where the majority of your traffic is coming from month on month and which keywords and search terms bring the most traffic to your site. You can optimise your site based on the metrics provided by Google Analytics