I bought this when my Kid was about 2.5yrs old, when kids are at “troublesome two” phase, just to make sure if I wasn’t screwing it up!
This book has a lot of very insightful observations. While I was not as bad as I had expected and was quite a bit on the right track, at least as per the book, there were few nuanced tricks that helped me a lot as I was navigating myself in the wilderness of being a first-time parent!