Don't play with firecrackers. Don't use a candle without your parents in the room. Don't play with BBQ starters. Don't light paper or other objects on fire to see if it burns. It will and can quickly get out of control.
Fires can get out of control in seconds.
Drop to the ground. Roll over and over, back and forth while covering your face and mouth. Roll until all the flames are out. You can practice it with your family, even your grandparents. And Know The Way Out Crawl low to get out of a smoke filled room.