Occult means “hidden”. It covers practices that are not approved of by God e.g., astrology (Is. 47:13), casting spells (Deut. 18:11), consulting with spirits (Deut. 18:11), magic (Gen. 41:8), sorcery (Exodus 22:8), witchcraft (Deut. 18:10), and spiritism (Deut. 18:11).
Occult practices such as ouji boards, tarot cards, astrology charts, contacting the dead, seances, etc. are to be avoided by the Christian.