from BIG BUDDHA, I want to take bus going to my hotel located at tai kok tsui. which bus? fare?

There is no direct bus between them. You may need to transfer twice. Take bus 23 from Ngong Ping Bus Terminus to Tung Chung Fire Station, then walk to Yu Tung Court, Shun Tung Road to take bus E21 and get down at Mong Kok Market, Argyle Street. Then walk to Pak Sang Building, Tong Mi Raod to take bus 12Bto Tai Kok Tsui Road. It costs around HKD35 in total.