Asanga was a prominent figure in the development of Yogachara Buddhism, also known as the "Yogacara" or "Mind-Only" school of Buddhism. He is believed to have lived during the 4th century CE in India, and is considered one of the founders of this philosophical tradition.

Asanga's main teachings revolved around the concept of "mind-only" or "consciousness-only" (cittamatra), which posits that all phenomena, including the external world and the individual self, are projections of the mind. This view is based on the belief that the ultimate reality is the nature of consciousness, and that all phenomena arise from the mind's perceptions and projections.

One of Asanga's key teachings was the concept of "storehouse consciousness" (alaya-vijnana), which refers to the repository of all past experiences and karmic imprints. According to Asanga, this consciousness is the basis for the continuous cycle of rebirth and suffering, as it perpetuates the illusion of a separate self and attachment to worldly desires.

Another important teaching of Asanga was the "three natures" (trisvabhava) doctrine, which describes the three levels of reality – the imaginary nature, the dependent nature, and the perfected nature. The imaginary nature refers to the illusory world created by the mind, the dependent nature refers to the interdependent nature of all phenomena, and the perfected nature refers to the ultimate reality of emptiness and non-duality.

Asanga also emphasized the practice of meditation and mindfulness as a means to understand and transcend the illusory nature of reality and achieve enlightenment. He advocated for the cultivation of wisdom and compassion, and the importance of ethical conduct in the pursuit of spiritual growth.

In addition to his teachings, Asanga is also known for his contributions to Buddhist literature. He is credited with writing several important texts, including the "Mahayanasamgraha" and the "Abhidharma-samuccaya," which provide detailed explanations of Yogachara philosophy and practices.

In summary, Asanga's main teachings revolved around the concept of "mind-only" and the importance of understanding and transcending the illusory nature of reality. He emphasized the role of meditation, wisdom, and compassion in achieving enlightenment, and his writings continue to be influential in the study and practice of Yogachara Buddhism.