In order to light three light bulbs with only two switches you must follow a specific circuit diagram. With this configuration you'll be able to turn on and off the light bulbs from any of the switches, independently.

In this current video I show only the theory of it. In the following video I show how to do in the "practical way":    • Como instalar um circuito threeway na...  

How to light bulb in distinct sessions | LED LIGHTING:    • Como ligar lâmpadas em sessões distintas