A question that gets asked a lot is they wonder about the the difference between the "Estimated Moving Average Sales and the Estimated Monthly Sales" that's shown in the cloud module.
The answer to that is: The average sales is based on the sales rank as it sits, and the average moving sales is the estimate based on the sales rank over 30 days.
On Book Bolt's Landing page when you log in, you will see a video there explaining the cloud in more details and the meanings of things. (As well, any tools you use inside of Book Bolt has a video explaining more about it).