Chaitanya Mahaprabhu, also known as Sri Krishna Chaitanya, was a 16th-century Indian saint and social reformer who is considered the founder of Gaudiya Vaishnavism. His teachings are based on the principles of Bhakti Yoga, which emphasizes devotion to God as the path to liberation.

One of the main teachings of Chaitanya Mahaprabhu is the concept of "Gaura Radha-Krishna," which refers to the union of the divine couple, Radha and Krishna, as the ultimate goal of human life. He believed that by constantly meditating on the love and devotion between Radha and Krishna, one can attain spiritual enlightenment and liberation from the cycle of birth and death.

Chaitanya Mahaprabhu also stressed the importance of chanting the Hare Krishna mantra as a means of connecting with the divine. He taught that by constantly chanting the names of God, one can purify the mind and heart and develop a deep sense of love and devotion for the divine.

Another key teaching of Chaitanya Mahaprabhu is the concept of "Sankirtan," which refers to the congregational chanting of the holy names of God. He believed that by coming together and chanting the names of God, individuals can experience a sense of unity and transcendental bliss.

Chaitanya Mahaprabhu also emphasized the importance of living a simple and humble life, free from material desires and attachments. He taught that true happiness and fulfillment can only be found in devotion to God, not in material possessions or achievements.

Furthermore, Chaitanya Mahaprabhu rejected the caste system and advocated for social equality and universal brotherhood. He believed that all living beings are equal in the eyes of God and that true devotion is not dependent on one's social status or background.

In summary, the main teachings of Chaitanya Mahaprabhu revolve around the principles of Bhakti Yoga, which include devotion to God, chanting the holy names, congregational chanting, simple living, and social equality. His teachings continue to inspire millions of followers around the world and have had a profound impact on the development of Hinduism.