I have a gas stove. This is connected to a big gas canister (I don't know the volume, but I'd guesstimate 20-30 liters). Whenever I want to cook, I turn on the valve on the gas canister, as well as the knob for the corresponding stove plate.
When I'm finished, I ususally turn off the stove knob first, followed by the valve on the canister. Would it be safer, waste less gas, or have any other effect to turn off the gas canister first, followed by the stove?
Edit: the stove has no safety features - you're free to turn on both the gas valve and the stove knob and let the gas flow.