I just uploaded this short lesson in the classroom, chapter 2
Lots of people asked me which tool I use to know the estimated daily and monthly sale of each book, I use Bookbeam but I wouldn't recommend it to a beginner, it's pricy (47$/month) and full of functions you will never use.
I found this extension called BSR Finder, which does the same but only costs 5$ per month and doesn't have the extra functions you'll never use.