Huineng, also known as the Sixth Patriarch of Chan (Zen) Buddhism, was a pivotal figure in the spread of Chan Buddhism throughout China and beyond. His teachings and influence had a profound impact on the development of Buddhism in East Asia.

Huineng's teachings were initially spread by his disciples, who were deeply inspired by his wisdom and teachings. They traveled throughout China, sharing his teachings with others and establishing monasteries and centers for Chan practice. These disciples were known as the "Five Houses of Chan," and they played a crucial role in the widespread acceptance and growth of Chan Buddhism in China.

One of Huineng's most famous disciples was Shenxiu, who was considered the leader of the Northern School of Chan. Shenxiu's teachings were widely popular, and many people were drawn to his approach, which focused on gradual enlightenment through meditation and study. However, Huineng's teachings were more radical and emphasized sudden enlightenment through direct experience, rather than intellectual understanding.

Despite facing opposition from the Northern School, Huineng's teachings continued to spread, and he gained a large following. His teachings were also recorded in the Platform Sutra, a text that became one of the most important Chan texts and was widely circulated throughout China.

Huineng's influence extended beyond China, as his teachings were brought to Korea and Japan by his disciples. In Korea, his teachings were embraced by the influential Seon School, which became the dominant form of Buddhism in the country. In Japan, his teachings were incorporated into the Rinzai School of Zen, which also became a major school of Buddhism.

One of the key factors in the spread of Huineng's teachings was their accessibility. Unlike other Buddhist teachings that were often limited to the educated elite, Huineng's teachings were simple and could be understood by people of all backgrounds. This made them appealing to a wide range of people, and as a result, Chan Buddhism became popular among both the elite and the common people.

Huineng's teachings also emphasized the importance of personal experience and direct realization, rather than relying on scriptures or teachers. This resonated with many people who were seeking a more immediate and direct path to enlightenment.

In conclusion, Huineng's teachings spread throughout China and beyond due to the efforts of his disciples, the accessibility and appeal of his teachings, and their emphasis on direct experience and realization. His teachings continue to be a significant influence on Chan and Zen Buddhism today, making him one of the most important figures in the history of Buddhism in East Asia.