There are two types of light switches, says Donnelly: a single-pole light switch, which has two wires, and a three-way light switch with three wires that usually look identical.

Learn how to install 3-Way Smart WiFi light switches with this step-by-step video. Please consult a certified electrician if you have any questions or concerns. Every wiring setup is unique, so be ...

In some (all?) variations of a three way switch, either of two wires MAY be hot. if you are using Black/White wire, no combination is 'right'.