The most important aspect of maintaining your furniture is controlling the humidity.
Rapid changes in humidity can cause cracking and/or warping. The ideal humidity range is 35-55%. However, constancy or slow change is much more important than the percent of humidity.
The ideal temperature for furniture is 70-72 degrees Fahrenheit.
Place your furniture away from heat sources or at least install a shield to deflect the heat away from the furniture.
Direct sunlight will fade your furniture. Minimize direct sunlight as much as possible. Objects setting on top of furniture should be moved once in a while to allow the surface to age consistently.
Avoid dragging or sliding furniture as much as possible. Sliding causes undue sideways stress on the legs of the piece.
Dust regularly with a slightly dampened cloth. If your cloth leaves any water spots on the furniture it is too wet.
Dry dusting simply moves the dust around the room and the dust particles scuff the furniture. For difficult spots use non-alkaline soap and water. Never use cleaners with abrasives. When you have a spill, wipe it up immediately.
Always wipe in the direction of the grain. If you use polish or wax make sure that it does not have silicone in.
Don’t drag lamps or other objects across the furniture. Lift them to avoid scratches.