Church and School of Wicca hundred covens. The School's curriculum includes classes on a variety of subjects associated both with Wicca as a religion and with occult and metaphysical studies and practices in general. These classes begin with an "Essential Witchcraft" course, which lasts "a year and a day". Other topics include: Advanced Celtic Witchcraft and Shamanism, Astral Travel, Astrology, Graphology, Mystical Awareness, a Natural Wicca Survey Course, Practical Sorcery, Prediction, Psychic and Herbal Healing, and Tantric Yoga. Much of the course of study is available to the student on video. The Church and School chartered several other churches and groups. In the early years
Wicca oral teachings passed along to their initiates. There are many variations on the core structure, and the religion grows and evolves over time. It is divided into a number of diverse lineages, sects and denominations, referred to as "traditions", each with its own organisational structure and level of centralisation. Due to its decentralized nature, there is some disagreement over what actually constitutes Wicca. Some traditions, collectively referred to as British Traditional Wicca, strictly follow the initiatory lineage of Gardner and consider the term "Wicca" to apply only to similar traditions, but not to newer, eclectic traditions. Wicca is typically duotheistic,