For example, your current switch may not match the d cor in your room or the color of your walls. Maybe it is old and unreliable. Either way, it is a relatively quick, inexpensive and simple project. A 3-way switch allows you to control one or more light fixtures from 2 locations. The basic principles of a 3-way switch are shown in the figure above.
Electrical basics are easy to understand, but working on electrical projects can be hazardous.
You should always take the proper precautions - turn off the circuit you are working on and use tools with insulated handles. Make sure you turn off the circuit you will be working on. Locate the breaker or fuse and properly disable it. Make sure you connect the wiring to the correct terminals on your new switch. Use the same relative connections from the old switch.