Guru Nanak, the founder of Sikhism, was a spiritual leader and teacher who lived in the 15th and 16th century in the Indian subcontinent. His teachings and beliefs have greatly influenced the Sikh way of life, shaping it into a unique and distinct religion.

One of the key teachings of Guru Nanak was the concept of "Oneness of God" or "Ik Onkar". He believed in the existence of one supreme being, who is the creator and sustainer of the universe. This concept of monotheism is deeply ingrained in the Sikh way of life and is reflected in their daily prayers and rituals. It also promotes equality and unity among all individuals, regardless of their caste, creed, or gender.

Guru Nanak also emphasized the importance of living a life of righteousness and morality. He believed in the principle of "Kirat Karo", which means earning an honest living through hard work and dedication. This teaching has shaped the Sikh way of life, making them hardworking and self-sufficient individuals who contribute positively to society.

Another significant teaching of Guru Nanak was the importance of seva or selfless service. He believed in the concept of "Vand Chakna", which means sharing with others and helping those in need. This teaching has led to the establishment of langars (community kitchens) in gurdwaras, where free meals are served to people of all backgrounds, regardless of their social status. This practice promotes equality and compassion, and it is a fundamental aspect of the Sikh way of life.

Guru Nanak also rejected the traditional caste system and promoted the idea of equality among all human beings. He believed that everyone is equal in the eyes of the divine and should be treated with respect and dignity. This belief has greatly influenced the Sikh way of life, making it a religion that promotes social equality and inclusivity.

Furthermore, Guru Nanak's teachings also emphasized the importance of meditation and connecting with the divine. He believed in the power of "Naam Simran", which means remembering and meditating on the name of God. This practice is an essential part of the Sikh way of life, as it helps individuals to find inner peace and connect with the divine.

In conclusion, Guru Nanak's teachings have played a significant role in shaping the Sikh way of life. His emphasis on monotheism, morality, selfless service, equality, and meditation has made Sikhs a compassionate, hardworking, and spiritually connected community. His teachings continue to guide and inspire Sikhs all over the world to lead a life of righteousness and service to others.