Nichiren Buddhism is a branch of Mahayana Buddhism founded by the Japanese monk, Nichiren, in the 13th century. It is based on the belief that the Lotus Sutra is the ultimate teaching of the Buddha and the path to enlightenment.

The core teachings of Nichiren Buddhism revolve around the concept of faith in the Lotus Sutra. This faith is not blind belief, but a deep understanding and conviction in the teachings of the Lotus Sutra. It is believed that by chanting the mantra "Nam-myoho-renge-kyo" and studying the Lotus Sutra, one can tap into their innate Buddha nature and attain enlightenment in this lifetime.

Another core teaching of Nichiren Buddhism is the concept of the Three Treasures - Buddha, Dharma, and Sangha. The Buddha represents the enlightened teacher, the Dharma represents the teachings, and the Sangha represents the community of practitioners. These three elements are seen as essential for spiritual growth and support.

Nichiren Buddhism also emphasizes the importance of karma, the law of cause and effect. It is believed that our actions, thoughts, and words create our destiny, and by chanting and following the teachings of the Lotus Sutra, one can purify their karma and create a positive future.

The concept of oneness is also a core teaching of Nichiren Buddhism. It is believed that all living beings possess Buddha nature and are interconnected. Therefore, harming others is seen as harming oneself, and compassion and respect for all living beings are encouraged.

Nichiren Buddhism also teaches the concept of the Ten Worlds, which are different states of existence that one can experience in their lifetime. These include hell, hunger, animality, anger, humanity, rapture, learning, realization, bodhisattva, and Buddhahood. By chanting and following the teachings of the Lotus Sutra, one can elevate their state of existence to the highest level of Buddhahood.

Lastly, Nichiren Buddhism emphasizes the importance of taking action to create a better world. It is believed that true enlightenment is not only for one's own benefit but also for the happiness and well-being of all beings. Therefore, Nichiren Buddhists are encouraged to actively engage in social and environmental issues and promote peace and harmony in the world.

In conclusion, the core teachings of Nichiren Buddhism revolve around faith in the Lotus Sutra, the Three Treasures, karma, oneness, the Ten Worlds, and taking action for the greater good. By following these teachings, one can attain enlightenment and create a better world for all beings.