After configuring Google Analytics on a site, reports show no information when browsing the site.
Tracking code has not been inserted into the templates to allow Google to track the information for the site.
The recommended method is to leverage the Google tracking code within a master page, which then applies the tracking code throughout the site. The following article contains more information on the tracking code: Set up the web tracking code.
To find the tracking code, navigate to the Google Analytics page and click admin > Property > Tracking Info > Tracking Code.