Without concrete, straightforward data, measuring the success of your website will prove to be very difficult indeed. You need to know who is visiting your site, the specific pieces of content they are engaging with, and how they came to find you to begin with.
Those are just a few examples of the information that can help you to define current marketing goals and future content. Website tracking software can provide you with all of these details, but without infringing on the privacy rights of your visitors.
Software designed to provide comprehensive insight into visitor behaviors and actions exists from a variety of companies. The challenge on your end is to figure out which features will best meet your needs.