Wiring a light switch where two lights are operated by one switch is demonstrated in this detailed wiring diagram.
This article and detailed wiring diagram addresses how to run two lights from one switch. This common question comes from a do-it-yourselfer working on his garage wiring who required some assistance wiring a circuit in his garage so that he could control two lights with one switch.
Wiring a light switch, with power coming into the light, and the switch leg running down to the switch, is explained in this wiring diagram.
This is the most common, and the easiest wiring diagram to follow of any of the wiring diagrams for a 3-way switch circuit. This wire diagram shows the wiring for source power into the first three way switch, then 3-wire cable to the next 3-way light switch, and then on to the light or light fixtures.