Actually, I practice certain occult rituals and have delved into divination as a form of spiritual practice. So as someone who identifies as a Spiritualist (more specifically - Spiritual Occultist) and has studied Occult rituals, Hermeticism, and Thelema for a very long time, I am deeply offended by the misrepresentation here.
Occultism is not the same as Wicca. Wicca is a type of Neo-Paganism (new modern form of Witchcraft) and Occult (or organized magic) is the study of magic, alchemy, ESP, astrology, spiritualism, and divination. Many Neo-Pagan sectors are influenced from the basic Hermetic teachings but they have intensely morphed over time into their own ideals... for example, Wiccans mainly believe in the two deities - a god and a triple goddess (or goddess) which is usually referred to a singlegodhead or duotheism. Some Wiccans define them as two distinct deities. It depends on your form of Wiccan practice. Then of course you take into account the Wiccan Rede, covens, magic rituals, the ideals of the pentagram (spirit, fire, water, earth, wind), and so on.
Yes, Aleister Crowley knew Gardner but they were not interconnected in their practices. Some Wiccans do use the term 'magick' to refer to Wiccan magic but ultimately that term is mainly associated with the Thelema practice. Gardner was influenced by some of Crowley's works but Crowley was never the father of Wicca nor directly associated with it. Crowley is the father of Thelema and was once a member of the esoteric Hermetic Order of the Golden Dawn. So Wicca did not grow out of the collaboration of Gardner and Crowley, if anything... Gerald Gardner and Doreen Valiente (one of Gardner's High Preistessess) collaborated together on introducing the Wiccan Rede (a code of Wiccan ethics).
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RecklessDreamer I would try reading the Wiccan Rede first and some other titles by Gardner and Valiente if you want to know more.