Vidya means knowledge; Yoga Vidya means knowing yoga. There is a difference between knowledge and cognition. Knowledge is impersonal, intellectual. Knowledge is an integral part of your behavior, mind, understanding, thinking, logic and what you believe in. He saw inner knowledge, awareness. Yoga Vidya is something you achieve and experience, not something you only know intellectually.
Vidya there are many levels. One is a way of life, because what you know must become your behavior and action. Your behavior and action is your way of life. Another aspect of vidya is sadhana, knowledge and cultivation. Another aspect of vidya is darshan, which is the philosophy of this subject. Another aspect of vidya is sampradaya, tradition, to know how this vidya has developed over a period of time through tradition. These are the four aspects: lifestyle, sadhana, philosophy, and parampara or sampradaya. These four aspects make up the overall picture of vidya.