This is a total count and graph of the change over time in your email subscriber list. The email subscriber list is powered by Mailchimp, which requires connecting your Mailchimp account.
The Revenue widget is an at a glance view of your recent revenue.
Clicking More will take you to the full Revenue Report.
The Subscriptions widget gives you a quick view of total subscriptions to your membership.
Clicking More will take you to the full Subscriptions Report.