Guru Nanak was the founder of  Sikhism and the first Sikh Guru.
The last living Guru, Guru Gobind Singh passed the Guruship of the Sikhs to the Eternal Guru of the Sikhs, the Guru Granth Sahib, the last Guru of Sikhism (the sacred text of Sikhism).
It also includes the writings of the some Sikh Gurus and the writings of Hindu and Muslims saints because all of these Bhagats and Bhatts shared the view of one universal creator God, they have experienced unison with almighty.
Every human being is  equal in front of Waheguru.
Guru Nanak was the founder of  Sikhism and the first Sikh Guru. The last living Guru, Guru Gobind Singh passed the Guruship of the Sikhs to the Eternal Guru of the Sikhs, the Guru Granth Sahib, the last Guru of Sikhism (the sacred text of Sikhism). It also includes the writings of the some Sikh Gurus and the writings of Hindu and Muslims saints because all of these Bhagats and Bhatts shared the view of one universal creator God, they have experienced unison with almighty. Every human being is  equal in front of Waheguru.
Sikhism in India