Dogen, also known as Eihei Dogen, was a Japanese Buddhist monk and the founder of Soto Zen Buddhism in Japan. He is widely considered one of the most influential and revered figures in the history of Japanese Buddhism.

Dogen's teachings and beliefs were heavily influenced by the Chinese Chan (Zen) tradition, which he studied extensively during his travels to China. However, he also incorporated elements of the traditional Japanese Buddhism of his time.

One of Dogen's key teachings was the concept of "zazen," or seated meditation. He believed that through the practice of zazen, one could attain a state of "samadhi," or deep concentration, and ultimately reach enlightenment. Dogen emphasized the importance of zazen as a means of directly experiencing the true nature of reality, rather than relying on scriptures or intellectual understanding.

Another central aspect of Dogen's teachings was the concept of "shikantaza," or "just sitting." This refers to the practice of sitting in meditation without any specific goal or expectation, simply being fully present in the moment. Dogen believed that by fully immersing oneself in the present moment, one could awaken to the true nature of reality and find inner peace.

In addition to these practices, Dogen also emphasized the importance of ethical conduct and compassion. He believed that the path to enlightenment was not just about personal liberation, but also about cultivating a deep sense of compassion and understanding for all beings.

Dogen's teachings also emphasized the interconnectedness of all things. He believed that everything in the universe is interconnected and interdependent, and that the illusion of a separate self is the root of suffering. By realizing this interconnectedness, one could let go of the ego and experience the true nature of reality.

Furthermore, Dogen rejected the idea of a fixed, unchanging self and instead emphasized the impermanence and constant change of all things. He believed that by letting go of attachments and embracing impermanence, one could find true liberation.

In terms of beliefs, Dogen's teachings were rooted in the Mahayana Buddhist tradition, which emphasizes the idea of "emptiness" or the lack of inherent existence in all things. He also believed in the concept of "Buddha-nature," the idea that all beings have the potential to awaken and become Buddhas.

In conclusion, Dogen's teachings and beliefs revolve around the practice of zazen, the concept of "just sitting," ethical conduct and compassion, the interconnectedness of all things, and the rejection of a fixed self. His teachings continue to be influential in Soto Zen Buddhism and have had a profound impact on the development of Japanese Buddhism as a whole.