I’d like to recommend Tarot . It enabled me to think thoughts I would not have otherwise discovered . Unfortunately if you study Tarot you will probably also practice divination . Fortune telling is worse than a waste of time . Arthur Edward Waite will tell you so in his excellent Pictorial Handbook . Unfortunately Waite’s book is also one of the best place to learn divination .
The second problem with fortune telling is that it seems to warp your understanding of Tarot . Every book by or for fortunetellers interprets one suit (swords or wands ) as the suit of “woe ” . That understanding may be handy ,fortuneteller short-hand but it’s a clean miss at grasping Tarot .