If someone wants to visit a Gurdwara, a certain protocol (or set of rules and expectations) must be followed. In Sikhism, there are strict rules against using tobacco, liquor, or narcotics. These things are not allowed in or around the Gurdwara. Before entering the hall, people take off their shoes, wash their hands, cover their head, and think of the Guru. Even non-Sikhs must cover their head with a handkerchief or scarf. After entering the hall, where Guru Granth Sahib is kept, people must walk slowly, bow humbly, and touch their foreheads to the ground, out of respect and love for the Guru. As people bow, they must place an offering (or gift) respectfully before the Guru. The offering may be money, flowers, or words of thanks. Any sincere expression of thanks is equally acceptable to the Guru. After bowing and offering, a person should sit quietly in the "Sangat" (congregation), without disturbing others. Usually men sit on one side and women on the other. People sit in a cross-legged position. Talking or whispering is not allowed.