Always keep and transport your cylinders in an upright position.
Ensure that the cooker burner is higher than the top of the cylinder.
Ensure your cylinders are outdoors.
To use the gas, turn on the regulator, light your match and finally, turn on the cooker bumper while regulating the amount of gas desired.
After you finish cooking, turn off both your cooker burner & the regulator.
If you suspect any LPG leakage, e.g., around the cylinder valve, pipe joint, or hose connection, pour some soapy water around the area where the leakage is suspected. If there is any leakage, the soapy water will make bubbles.
Never Ever use naked flames such as lit matches to check for LPG leakages.