Here are three videos, produced by the Seattle Office of Emergency Management, which can show you how to turn off your gas, water and how to use a fire extinguisher.
Gas Shutoff: https://youtu.be/loDeN-YPP4E
Water: https://youtu.be/UJN_OyIzFrU
Fire Extinguisher: https://youtu.be/NvbuYuAJGAs