Question

what were the teachings of guru nanak?

Answer 1

When I was there, Hari was not there. When Hari was there, I was not there. Nanak, Japji Sahib
The Mul mantra or the seed mantra with which the Adi Granth begins contains the essence of Nanak's teachings. It declares that God in one and His name is Truth. He is eternal and formless, who can be realized only through His grace. Nanak offers a simple yet direct solution to reach God and that path is through the heart of the seeker. His teaching is earthly and practical, which anyone test and find God within themselves. Through singing and praying one becomes immersed in the thought of Him and enters the state of Samadhi, or union with God. Thus, for Nanak prayer becomes the path when one is totally immersed in it. The following are a few important aspects of his teachings.
Ahimsa or non violence
Do not speak evil of any one. This is the ahimsa of thought. Do not speak harshly to any one. This is the ahimsa of speech. Do not impede any one's work. This is the ahimsa of action. Forgive him who speaks ill of you. Practice physical, mental and spiritual forbearance. Help those who are suffering even at the cost of your life.
Asceticism
Guru Nanak did not advocate ascetic life as a way to salvation. He himself led a normal life, amidst society, in touch with people of his time, though he was completely God centered and detached from the world and its ways. He preached that asceticism was not the way and the way to salvation was not incompatible with good life, laughing, eating, playing and dressing well.
Humility

Answer 2

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• The most famous teachings attributed to Guru Nanak are that there is only one God, and that all human beings can have direct access to God with no need of rituals or priests. His most radical social teachings denounced the caste system and taught that everyone is equal, regardless of caste or gender.