(A version of this post originally appeared on my Substack.)

Image from Canva

I am obsessed with tracking my book sales numbers.

And not just what I earned in royalties but all the numbers: what I sell at book signings versus sales that come from store orders or special promotions, how many of each book I sell, what sells more—ebook or paperback—for each title, and anything else that I need to know.

And to track these numbers, I turn to my tr...