Ensure your candle is securely in a candle holder that is on a flat surface away from anything flammable or a draft before lighting. If flame becomes too enlarged or excessively smoking, extinguish.
Remember not to leave a candle unattended or alone with pets or children.
Extinguish when finished use, blowing short puffs of air will have less risk of wax splatters.
Go forth and be a responsible candle user!