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These three books are an ideal starting place for anyone interested spirituality with a magical leaning. Whenever I recommend these books I always say that they do have a wicca-vibe, but they are a wonderful, gentle source of knowledge ~ and would be a good introduction for young people too.
These three books are key to my day to day practice. There are lots of guides and meanings books out there. But if you stick to the same handful, your path will align with those explanations.