Google Analytics is a potential too which is commonly used by bloggers from all around the word. If you smart enough, you can maximize the use of the Google Analytics when you develop a website.
You can use the admin function on Google Analytics. You may know a little about Google Analytics, but you do not understand enough how to use it. You should not just let it on the website without using it properly.
Indeed, the data obtained by the Google Analytics is sufficient until finally, you feel satisfied already without customizing anything. However, there are some customizations that you have to set at the moment you install Google analytic on your website.