Here’s a secret.
When I mentioned that I was going put together a course setting all this down, I was contacted by more than one successful indie author who suggested that I keep it to myself. Why? Because they were using ads very successfully and wanted to keep them to themselves.
I’ve been teaching students how to do this and the results have been astounding.
The ads work in any genre, for any kind of writer.
I’ve seen romance authors make FIVE times their investment on ads. I’ve seen writers from niche genres ADD THOUSANDS (yes, literally) to their mailing lists.