This is the first of a four-volume set where all the openings are covered. This first volume covers everything 1. e4, the second everything 1. d4, the third everything Indian Defences, and the 4th everything leftover, covering 1. c4 and 1. Nf3 with the remaining seldom-played openings at the GM level but ones you see at chess clubs and online so while they are usually categorized as lesser-played, for most of the people buying these books, they aren't that rare.
So covering all of the four in this first review is all that needs done. Each has everything you can pack into it about the various openings under that particular first move. Each opening is accompanied then by at least half a dozen excellent examples of GM play so you get what you need to start off and keep handy for reference. Additionally, there are plenty of excellent board diagrams not juts showing positions but arrows showing various choices of where the lines are going and goals being aimed at.
If there is one criticism I have is that they for some reason decided to use what I call the 'overkill-annoying-algebraic-notation' ... such as 1. e2-e4 or 2. Ng8-f6 ... there's no need for the first half of that notation since, in the case of the Knight's example, only the Knight on the g8 square can possibly reach the f6 square so it's completely unnecessary and frankly, imho, incorrect algebraic notation (these particular volumes use Figurine Algebraic Notation which is the easiest to read, again imho, except for the unnecessary listing of the piece's current square location. I don't know why some publishers/editors/whoever-is-in-charge-of-this-at-the-company insist on doing this. Algebraic Notation was finally and officially adopted as the standard chess notation to replace the old-fashioned Descriptive Notation which was 'long-winded'. Thus this type of Algebraic Notation defeats the purpose of the shortened and more accurate form most common over the last 40 years or so.
Other than that, if you're looking for a very nice gift for a young player, these four volumes would make a great addition to their burgeoning library. Plus they look great, very high-quality paperback assemblage, tightly glued spines that look like they will last through plenty of study, and no-gloss paper of better-than-normal quality. The set also looks darn nice together on the bookshelf.