It's not particularly a book nor an author that I would recommend. In fact I find it a bit egotistical that the author feels that her one book contains all the information you'll ever need. It's almost cult-like. Those of us who have been at this for many years still never stop reading and studying.
To start with, here are some books that I would suggest.
''A Witch Alone'' by Marian Green
''The Elements of Ritual'' by Deborah Lipp
''Witchcrafting'' by Phyllis Curott
''21st Century Wicca'' by Jennifer Hunter
''Before You Cast a Spell'' by Carl McColman
''When, Why...If'' by Robin Wood
''Practical Pagan'' by Dana Eilers
''Wicca; A Year and a Day'' by Timothy Roderick
"Wicca" by Thea Sabin
You can also find the recommended reading list that my coven uses at: http://www.tangledmoon.org/reading_list.htm
Here's some websites that you may find useful in helping you with questions.
http://www.tangledmoon.org (this is my own coven site.)
Hope this helps you get a good start on your studies. And feel free to ask me, or the others here on the board if you have any specific questions we can help you with.