Mindset is about the contrast between "fixed" and "growth" mindsets. Note - only two, no continuum, no shades of grey. While accepting that this is intended to be a "popular" book (and that Dweck has published a body of formal work), this is poorly written - the cod vernacular gets in the way, with double negatives, etc.
I'm not going to mention the sickening P.R. "my students begged me to write this book", so hurrah for R.A. Cooper:
"You probably don't need to buy the book - it's mostly pop-psych waffle ... You know you're in la-la land when the author starts selling you a 'Brainology' program."