Taran, the assistant pig-keeper who wants to be a hero, goes questing for knowledge of his parentage, hoping that his journey will ennoble him in the eyes of Eilonwy, the princess with the red-gold hair. Accompanied by several loyal friends, Taran begins his search when three wily enchantresses of the Marshes of Morva send him to consult the Mirror of Llunet for the answers he is seeking, cryptically promising that "the finding takes no more than the looking." During his adventures he meets Craddoc, the shepherd, and the common people of Prydain, whom he comes to respect and admire. With their help, he continues his mission to learn the secret of the Mirror and the truth about himself.
If I had to pick a favorite from this series, Taran Wanderer would probably be it. It's a quintessential "finding oneself" novel in the fantasy genre. Taran goes from one interest to another and learns plenty about himself in the process, of course.