Tulku Urgyen Rinpoche was a highly respected Tibetan Dzogchen master who was known for his profound wisdom and teachings. He studied and taught a wide range of Buddhist texts and teachings throughout his lifetime, including both traditional Tibetan Buddhist texts and more contemporary teachings.

One of the key texts that Tulku Urgyen Rinpoche studied and taught was the Tibetan Book of the Dead, also known as the Bardo Thodol. This text is a guide for the deceased through the intermediate state between death and rebirth, and Rinpoche was known for his deep understanding of its teachings. He also taught extensively on the teachings of the Dzogchen tradition, which focuses on the direct realization of one's true nature.

In addition to these traditional texts, Tulku Urgyen Rinpoche also studied and taught teachings from the Mahayana tradition, particularly the Prajnaparamita teachings on emptiness. He also had a deep understanding of the teachings of the Madhyamaka school, which emphasizes the middle way between extremes.

Rinpoche also studied and taught extensively on the teachings of the Kagyu and Nyingma schools of Tibetan Buddhism. He was particularly well-versed in the teachings of the Great Perfection, or Dzogchen, which is considered the highest and most direct path to enlightenment in the Nyingma tradition.

Furthermore, Tulku Urgyen Rinpoche was also a master of the Mahamudra teachings, which are considered the highest teachings in the Kagyu tradition. These teachings focus on the direct realization of the nature of mind.

In addition to these traditional texts and teachings, Rinpoche also studied and taught more contemporary teachings, such as the teachings of the great Tibetan master, Jamgon Kongtrul Lodro Thaye. He also taught extensively on the teachings of the renowned Tibetan yogi, Milarepa.

Overall, Tulku Urgyen Rinpoche was a highly accomplished and knowledgeable teacher who had a deep understanding of a wide range of Buddhist texts and teachings. His teachings continue to inspire and guide students of Buddhism all over the world, and his legacy as a great master lives on through his teachings and the many students he touched throughout his lifetime.