A few basic facts about Wicca (which was founded by a British Civil Servant sometime in the '40s.) as related by a Wiccan:
Goddess is Great Mother Goddess. She may be referred to a Aphrodite or Kuan-Yin. She is in everything, in every person or plant or rock. You can speak to her and pray to her. She takes many forms. She is the moon, and is often thought of as the Triple Goddess as manifested in the Maiden, the Mother, and the Crone. Her symbol is a full moon flanked by crescent moons. According to Wicca, there is both a Goddess and a God. The God is the Sun. He is the hunter and Green Man; the father.
Traditionally, the Goddess and God are lovers. They are equals. Almost anything can be categorized as either in the Kingdom of the Sun or the Kingdom of the Moon. They are in everything, according to tradition.Devil Wiccans in no way worship the devil. In fact, Wicca as a religion does not even believe in a devil. Although pictures of God or Goddess may have horns, this was accepted in ancient times and was not a sign of evil. It was common practice for conquering religions (in this case Christianity) to demonize the gods they replaced.
There are not many rules in Wicca, but one that most Wiccans follow is the Wiccan Rede (also known as the Wiccan Law, Wiccan Rule, etc.): An it harm none do what thou wilt -- meaning, do what you want, but don't harm anyone. Another law some Wiccans folow is the Threefold Law or Law of Three. It is that what you do, good or bad, will come back to you three times as strong. Others believe in Karma, which is similar to the Threefold Law.