Propane is a safe, economical fuel but like other forms of energy it can be hazardous if not handled properly. Propane has an unusual odor, sort of like decayed cabbage, a dead mouse, garlic, or rotten eggs. Ask your delivery man to let you smell the gas. Learn to identify this odor now.
Leaking propane is heavier than air and without proper ventilation can collect in low places like basements, pits, on the floor, etc. If ignited, propane will burn or explode.