How do I wire a 3-way switch to control two lights?

Wiring a 3-way switch system to control two separate light fixtures simultaneously involves connecting the fixtures in a parallel configuration rather than a series. First, ensure safety by shutting off the circuit breaker and verifying zero power. Second, wire the two 3-way switches together using standard traveler cables attached to the brass traveler terminals. Third, connect the incoming power line to the common terminal of the first switch, and run the wire from the common terminal of the second switch to the first light fixture, then daisy-chain a parallel wire feed from the first fixture box to the second light fixture box. You can troubleshoot multi-fixture setups safely. You can verify that your corrective action is successful when restoring power and toggling both switches turns both lights on and off together.