The word Guru is made up of two parts. Gu= darkness and ru= light. So a Guru is one who removes the darkness of ignorance with the light of knowledge. Guru also means teacher. Sikhs means student, so it makes sense that a Sikh would follow a Guru.
Ofcourse he is.
There is no leader of Sikhism currently. But Sikhs call their leaders "Guru". The first Guru who formed Sikhism was called Guru Nanak
No, They called Rab and Guru is leader of their religion.
Guru Gobind Singh is the tenth guru of Sikhs
Shri Guru Granth Sahib is the holy scripture of the Sikhs, revered as the Guru of the Sikhs.
Sikhs DO NOT worship Guru Nanak. They worship the Divine Light of God that is in Guru Nanak. Guru Nanak is NOT a deity in the Sikh religion, he is a teacher. Sikhs still bow today to Guru Granth Sahib. That does not mean they worship it, it means they revere the Divine Knowledge that it contains.
Guru Tegh Bahadur was the ninth Guru of the Sikhs.
Adi Granth or Guru Granth Sahib is sacred book of Sikhs, which is regarded as the final Guru of the Sikhs. It contains the hymns of Sikh gurus.
Sikhs don't have any religious leader nor do they have any priestly class for performing religious functions.At their place of worship which is Gurudwara, there is usually a person who act as more of a care taker than being a religious leader. That person is usually called Granthi or Bhaji. Sikhs do have what they call Akal Takhat where they do make religious decision. The head of Akal Takhat is called Jethadar. But its more of an organisation where people make decision after discussion and sometimes even arguments. But as such there is no religious leader.
Guru Granth Sahib Dev Ji is the living embodiment of Guru as well the eternal Guru of Sikhs, it contains the teachings of Sikhs Gurus as well as the teachings of Sikh Devotees.
Guru Granth Sahib Ji is the Guru of Sikhs and thus hold the highest importance for Sikhs when it comes to the matter of religion as Guru Granth Sahib Ji is the authority of the Sikhs.
Guru Nanak is the final and eternal guru of the Sikhs. He was the first of the Gurus to find the Sikh religion.