Usually, guides and instructional E-books, regardless of what they cover, are very biased towards one of the ends of the experience spectrum: they're either aimed at newbies or at pros and there's little leverage in between. In the field of hydroponics, if you're slightly experience but still not worthy of considering yourself a professional, you'll be hard pressed to find a guide that's suitable for your skill level, because of the problem I mentioned above. I was in this tough spot and I was almost ready to give up on trying, until I found the Hydroponics Garden E-Book.
The Hydroponics Garden E-Book is what you would call a complete guide to hydroponic gardening and growing stuff in soilless environments. It covers almost every aspect that's related to gardening that you can think of and it does so in a very clear, structured manner. Every term is explained thoroughly, which is very helpful for people that are just starting in this field.
Probably one of the most important aspects of an instructional E-book is the way it's structured and formatted and I've seen countless books that had a serious problem here. Messy formatting, no labeling, no ordered or unordered lists, stuff flying around the page and many other problems are common in such E-books. Fortunately, the Hydroponics Garden doesn't fall in this category, as it has a very clear and eye soothing build-up of information that can be easily picked up. Pictures don't abound and some of those that are there aren't on the same quality level as the rest, but seeing how the information attached to them was good, I was willing to let this small mishap go by.
Another feature of the Hydroponics Garden that I found surprisingly nice is the set of printable labels at the end of the book. There are about a dozen labels for different plants that are commonly grown in hydroponic environments, such as Parsley, Tomatoes, Oregano or Lettuce. Each of the labels contains a short paragraph of useful information about the particular plant it features, a few nutritional facts and a few blank rows where you can write your own notes. The labels can be printed out and cut apart by following the dotted line that encapsulates them with a pair of scissors.
In what regards the actual content of the book, once you're passed the first few chapters, you should have a clear idea on what hydroponic gardening really is, regardless of your prior experience with it. Afterwards, you will move on to more complex stuff, like how to handle nutrient solutions and feed your plants, how to set up your lighting system and how to choose the right type of light, or even a few chapters dedicated to building your own hydroponic system from scratch. The content in these chapters seems to be the result of some hard work and the Hydroponics Garden is definitely not one of those crappy E-books that are hastily written for the profit. The information it contains is genuine and useful and it's a great read, regardless if you're a beginner, a professional or anything in between.
Oh and I almost forgot. Buying the Hydroponics Garden E-book, you also get a bonus book called "The Super Hydroponic E-book" and an audio .mp3 transcript of the book which proved to add real value to the purchase. I encourage you to get this pack, because it has a great value-to-price ratio.