Three-way switches are common at staircases, hallways or large rooms with multiple doorways. Most of the problems with these switches result from a miswired switch.
Search results for:
Undercabinet lighting is a slick way to light up a surface. You can buy lots of different varieties of light fixtures, some with a cord and plug, others that are hard-wired and still others that are battery-operated that just stick to the underside of your cabinets.