It's been almost 10 years since I wrote my original commentary on this one, which I'm going to leave below the updated version.
A lot has changed in the world, and for me personally, since I first read any of Silver's books. I picked this one up, and the rest from this series, as well as her teen witch book, waaaaay back in the late 1990s and early 2000s. Back then, I was mesmerized. Baby-witchling me ate up her words, even the things that made me feel uncomfortable. I didn't have the life experience or anything else to help me articulate what it was that made me uncomfortable, and even now there are other people who can do so better than I could.
Basically, I don't recommend this one. At all. There are far better sources for you to pick up if you want to learn about witchcraft and/or Wicca. There are also different kinds of Wicca out there (a lot of traditional Wiccans, from what I've seen/heard, are not particularly fond of Silver and other authors like her), and even more varieties of witchcraft. (Feel free to send me a message if you want some recs.)
I don't remember enough of the specifics of this book to detail exactly, point by point with page references, why it's not great, but it shouldn't be hard to find other people's dissections of it by googling something like "Silver Ravenwolf cultural appropriation." That should get you started. (Cultural appropriation is not the only issue with her books, that's just an example search phrase to use.)
No author is perfect, but yikes. I'm not sure this is all from TRASB, but what I do remember of skimming through these books a few years ago are: cultural appropriation, racism, saying Wicca=Witchcraft and only Wiccans are real witches, Christian bashing and hatred (I mean...I get where those feelings come from, but get a grip already), crappy history that isn't actually accurate (ex.: she promotes the 9 million dead witches Burning Times thing), etc. She also refuses to stop using slurs, despite people bringing it up with her quite recently, which is oh so charming.
However...If you did pick this up, don't despair. You can take something useful away from pretty much anything you read. Just read it critically and don't take anything any singular author says as "The one true and only way" to do things. Be critical, do your own research, and if something feels off/wrong/whatever, listen to your gut about it.
And here's what still-a-baby-witchling me had to say, before finally gaining access to better sources:
I know that many Pagans do not like Silver Ravenwolf, but I've always enjoyed her books, both fiction and non-fiction. This book is no exception. She offers the same information as any other author on the subject, but in a much more lighthearted and down to earth style. As with any other book concerning Paganism in any form, I would recommend that someone learning about Wicca and/or witchcraft at least give her a chance before coming to a conclusion. This book, in my opinion, is a very good beginner's book for those studying Wicca and/or witchcraft.