This book provides you a basic set of skills and knowlegde, on which you can build further on your own or with a help from more "advanced" books. The book has only 64 pages, but it is probably VERY intense if you have never learnt to play any stringed instrument.
Mr Beloff starts with such basics as the name of the parts, holding the instument, forming chord and reading chord diagrams, how to strum etc. Unfortunately you are supposed to actually read and understand them, but it's not overwhelming.
After that, you learn 29 songs one by one. Though it's possible to flip through and pick up your favorite song, actually I recommend to proceed one by one: The author carefully arranged the materials from the simplest to modestly challenging, and each new song exposes you to one or two new element(s), be it the chord, key, strum pattern and/or time.
Once something is presented, in general it is not repeated later, so you'll have to go back and forth quite often to revisit what you've learnt in the past (chord chart at the end of the book is going to be your life saver, though). Yet IMHO he was successful in making it fun. I wish this kind of book were available when I started playing guitar 17 years ago.
If you remember all of these 29 songs by heart, this book is not for you. On the other hand, this makes a great songbook if you're searching for something that you can sing together with others with good enjoyable ukulele arrangement. As a parent of school-age kids, I was quite happy with this book.