If you are aware of these troublemakers, the resulting damage can easily can be avoided. Sunlight's ultraviolet rays can damage wood finishes. Liquid spills will damage furniture if not removed promptly. Use coasters under beverage glasses and saucers under cups and flower pots. If a spill occurs, immediately blot it gently without rubbing the surface.
Heat creates a chemical change in the furniture finish which can result in a white spot.
Use protective pads under hot dishes, utensils or cooking appliances. High humidity causes wood to swell. Low humidity causes wood to lose moisture and shrink. Extreme changes cause warping, splitting and cracking. Try to keep humidity as constant as possible.