There are a few things that I always try to point out within all of my reviews: 1.) the quality of the product 2.) the quality vs. the cost 3.) whether you should buy the product.
So, first of all, let's take a look at the quality of this book. The first thing that I noticed upon taking a look is that it has an active (clickable) Table of Contents, which makes your job a lot easier as a reader, particularly if you're skipping around a lot. The book has some good beginner's information for those who are interested in gardening, especially the subtopic of vertical gardening. It explains how to garden both outdoors and indoors, which is important for those who live in apartments or other areas with a lack of free space. Overall, this is a good-quality book.
Now, the quality vs the price. At the time of this review, the price is $2.99. For this low, low price, you honestly can't get much better than this. It covers everything that the casual gardener would need to know about, and even ventures into many other side topics that are important as well. A good book at such a low price is rare.
Should you buy it? Well, if you're interested in starting a garden (indoors or outdoors), then I don't see many better options than this book for where you should get started. Of course, there are online resources that you could use, but they rarely will contain as much information as a book, and most likely you will be forced to scour the Web for hours to find all of the relevant information. So overall, I think that this is a well-rounded gardening book for a very reasonable price.