As a marketer you need all kinds of insights and metrics so you can monitor your campaigns. In Sitecore you will have the Experience Analytics for basic analysis, the Experience Profile for research individual users and there is the Path Analyser with which you can analyze paths.
But did you know that you can configure custom funnels to further analyse in the Path Analyzer? You can use pages, page events or goals to setup your funnel. Learn how to setup and deploy a custom funnel at Sitecore.net. You can see all kinds of information like how many visitors there were at the first page and how many reached the last page. The same applies to engagement value. Or see in the radial view where visitors left or stepped into your funnel. Very powerful!