Check holiday lights and water your tree every day
Added
Before decorating, throw out any light strands with frayed or pinched wires and follow the maker's limit on how many strands to connect. Water a real tree every day, keep it at least 3 feet from fireplaces, space heaters and heat vents, and keep candles 12 inches from anything that burns.
The result
Result: U.S. Fire Administration (citing NFPA): almost one-third of home Christmas tree fires are caused by electrical problems, and a dry tree can burn very hot and very fast.
Source
U.S. Fire Administration: Holiday Fire Safety (opens the original source in a new tab). Check it for the latest numbers before you act.