Welcome to the third part of this course! This time, we're going to take a look at customer activity in our store.

First, we'll look at active customers. We'll learn how to count the number of active customers: in total and in registration cohorts. Then we'll determine the average value of customer orders. Finally, we'll define "good customers" and see if they have any common characteristics that we can use in our marketing campaigns.

Let's get started!