Guru Nanak was the founder of Sikhism and the first Sikh Guru. The last Guru, Guru Gobind Singh passed the Guruship of the Sikhs to the Eleventh and Eternal Guru of the Sikhs, the Guru Granth Sahib (the sacred text of Sikhism). It also includes the writings of the Sikh Gurus and the writings of Hindu and Muslims saints because all are equal in front of Waheguru. But many people get misconception that Sikhism is derived from Hinduism but in reality these both are totally different religions. Only language matches somewhere but meaning and teachings of Shri Guru Granth Sahib Ji is completely different from Hinduism. Sikhs do not believe in idols and other rituals, they only believe in one god i.e. Waheguru.
Guru Granth Sahib Ji clearly states that-