Understanding how your players are interacting with your game is critical to knowing where to make improvements. Unity provides a helpful set of analytics, which can help you get started monitoring player behaviour.
A dashboard isn’t all you need, however. You also have to install the analytics library and add using UnityEngine.Analytics to your scripts.
From there you just have to start generating events, which only takes a few lines of code, although you may need to think about a scalable implementation before adding analytics events all over the place.
You might have to wait a while after adding new events and running your game, but eventually, you should see your events start to pop up on your dashboard linked to from your Analytics Settings.