As a kid, I was not really in to public speaking or just speaking in front of a large crowd. The book gave discussions and tips to overcome that. It also discussed on how to improve your speech and on how to become an effective speaker. It is informative and very helpful for a lot of people.
Honestly this information can be found online. Much of the content is very basic and does not expand on how to properly deliver a message. How to structure your speech or responses. There are multiple formats of delivery that were not taught, rather this book focused on things like "Practice in the venue" or "Drink water..."
A simple book with good and valid points that anyone can put to immediate use. However, it reads partly like a website sales copy and appears as if the only editing was by Microsoft's spellchecker. Just reading the introduction tells one it's sloppy work.