Does the order in which I turn off the gas stove matter? 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.
I had this type of stovetop for many years. The way I usually did was:


Turn off the stovetop
turn off the canister


The next time you turn the canister on, gas won't leak through the burner you left on (because you didn't!). And the amount of gas left in the connecting hose is negligible and should be safe to leave it there until the next use.