Introduction:
Nalanda University was a renowned center of learning in ancient India, located in present-day Bihar. It was established during the Gupta period and reached its peak during the reign of the Pala dynasty. The university attracted scholars and students from all over the world and was famous for its teachings in various fields.

Buddhism:
Nalanda University was a great center of learning, especially in Buddhism. It was founded by the Buddhist monk, Kumarajiva, and was home to many renowned Buddhist scholars and practitioners. The university offered courses on various aspects of Buddhism, such as philosophy, meditation, and scripture.

Jainism:
Although Nalanda University was primarily a center for Buddhist studies, it also offered courses on Jainism. Many Jain scholars and practitioners studied at the university and contributed to its intellectual growth. The university had a library that contained both Buddhist and Jain texts.

Vaishnavism:
Nalanda University did not focus on Vaishnavism as its primary field of study. However, the university did offer courses on Vaishnavism, which is a branch of Hinduism that focuses on the worship of Lord Vishnu. The university's library had a collection of Hindu texts that included Vaishnavism.

Tantra:
Nalanda University did not offer courses on Tantra. Tantra is a form of Hinduism that involves spiritual practices and rituals. Although the university had a library that contained Hindu texts, it did not have a significant focus on Tantra.

Conclusion:
In conclusion, Nalanda University was a great center of learning, especially in Buddhism. The university attracted scholars and students from all over the world and offered courses on various aspects of Buddhism. Although the university also had courses on Jainism and Vaishnavism, its primary focus was on Buddhism. The university did not have a significant focus on Tantra.