You are operating a powerboat at night, you see red and white lights on the other boat, what should you do?

Sidelights: These red and green lights are called sidelights (also called combination lights) because they are visible to another vessel approaching from the side or head-on. The red light indicates a vessel's port (left) side; the green indicates a vessel's starboard (right) side. Those are just the sidelights.

Hope I helped!

Explanation:

Of another boat is approaching to you, and you see red light, it indicated port side of the boat.

White light indicated you are approaching to starboard side of the boat. At night it is very important to know the correct route and knowledge of what different color light means.

Port is the left-hand side of the boat and Starboard refers to the right side of the boat and is a nautical term  used while driving boats.