Google Sheets makes it really easy to aggregate data via the Status Bar. For example, if we highlight all the Payment Amount values in our Getting Started Payments dataset, Google Sheets will automatically summarize:
In the screenshot above, Google Sheets shows us the Sum of all highlighted values: $10,317.06.
In fact, opening up the widget in our Status Bar will show us a handful of the most commonly used aggregations (also known as descriptive statistics) for our highlighted cells: