This is an excellent book to learn the fundamentals to get started learning electronics. I really don't have much of a background in electronics. I got this book because I read about it in Make Magazine. Also I have been trying to complete a correspondence course in electronics. This book reviewed what I had already learned in a fraction of the number of pages that I had to read. It also introduce things that my course hasn't cover yet. Not bad for 128 pages.Think about it: many high schools don't have an electronics program. Mine didn't. It isn't that the material is unimportant or doesn't have job opportunities. The electronic field is huge. This is the book to start with if you know nothing of electronics and are doing a self study.The book is easy to understand. It wasn't until it discusses "Digital Integrated Circuits" in chapter 6 that I did not have a full understanding of the material. But I guess this is just a "start" to learning such topics. But I think it works, because it is more advanced and thus gets the reader's interest. However diode and transistor gates can become complicated.It is important to note there is not much math here except for some basic algebra. A few formulas, truth tables, and graphs of functions are present but the book uses them to show how electronics are represented and not to have the reader do many math problems.I have yet to build the circuit projects in the back of the book. That is the next step. Forrest Mims, the author, states that you have to do them to get the complete understanding of circuits. That makes sense.In summary, this is an excellent book and I give it a high recommendation. It is the fastest way to learn all about electronics that you were never taught.