Secret teachings in Ramayana by Ravana to his Spouse Mandodari.
He revealed about eight Unhealthy traits of waman to his spouse.
Watch this video to find out about these eight Evil traits of girl. One ought to keep away from marrying such girl, or keep away from friendship with them. Ravana additionally taught some classes to Lakshamana (Laxman).
There are many religious classes and secret teachings in vedas and different hindu scriptures.