Bön is an indigenous Tibetan religion that predates the arrival of Buddhism in Tibet. It is a shamanistic and animistic tradition that incorporates elements of Buddhism, Taoism, and the ancient indigenous beliefs of Tibet. The main beliefs of Bön revolve around the concept of the three realms, the three poisons, and the four doors.

The three realms in Bön refer to the physical realm, the spiritual realm, and the intermediate realm. The physical realm is the world we live in, while the spiritual realm is the realm of the gods and deities. The intermediate realm is the realm of the spirits and is believed to be the source of illness and suffering. Bön practitioners believe that all three realms are interconnected and that one's actions in one realm can affect the others.

The three poisons in Bön are ignorance, attachment, and aversion. These are seen as the root causes of suffering and the obstacles to achieving enlightenment. Bön teachings emphasize the importance of recognizing and overcoming these poisons in order to attain spiritual liberation.

The four doors in Bön refer to the four paths to enlightenment. These paths include the path of renunciation, the path of transformation, the path of self-liberation, and the path of spontaneous presence. Each path offers a different approach to spiritual growth and liberation, and Bön practitioners may choose the path that resonates with them the most.

Another important belief in Bön is the concept of the Five Elements. These elements (earth, water, fire, air, and space) are seen as the fundamental building blocks of the universe and are believed to influence all aspects of life. Bön teachings emphasize the balance and harmony of these elements in order to achieve physical, emotional, and spiritual well-being.

The practice of ritual and ceremony is also an integral part of Bön. These rituals are believed to connect practitioners with the spiritual realm and to help them achieve spiritual goals. Offerings, prayers, and mantras are often used in these rituals to invoke the blessings of deities and spirits.

In addition to these beliefs, Bön also places a strong emphasis on compassion, kindness, and respect for all living beings. Bön practitioners strive to live in harmony with nature and to cultivate a sense of interconnectedness with all beings.

In conclusion, the main beliefs of Bön revolve around the interconnectedness of the three realms, the importance of overcoming the three poisons, and the four paths to enlightenment. The practice of ritual and ceremony, as well as the emphasis on compassion and respect, are also central to the Bön tradition.