I don't really understand how this works – The Good Health Guide I : Diet , Fitness , Nutrition , and Weight Loss Book Summaries Review

I downloaded it a while ago, looked at it but didn't "get it". I deleted it, then downloaded again because I forgot what it was. But once again I don't know how it works. It appears to be book summaries... To sell the books? I guess I just need it laid out for me. Clear instructions. And I'll admit I may have bypassed them... There is not one review for this app. Which I find strange. Twilight zone?
Review by azsundance on The Good Health Guide I : Diet , Fitness , Nutrition , and Weight Loss Book Summaries.