Don't use gift wrap or packing materials to light fires. They burn too fast. Keep lit candles away from greenery and curtains. Never leave children unsupervised around burning candles or fires. Make sure electrical cords aren't pinched by furniture and don't run under carpet or coil around themselves.
Excess heat can cause sparks.
Inspect lights for exposed or frayed wires, loose connections or broken sockets. Avoid overloading extension cords. Only put two or three strings of lights on each cord. Always turn off tree lights when you go to bed or leave the home. Likewise, make sure all candles and fires are out when you go to bed or leave the home.