If you just run from an existing light to new light you can do it with two wire cable.
In the existing fixture there will be one wire (red or black)that is not connected to the fixture and just feeds through. Leave that wire alone and connect your new cable to the white and other wire (red or black) that is connected to the existing fixture.
In the existing fixture there will be one wire (red or black)that is not connected to the fixture and just feeds through. Leave that wire alone and connect your new cable to the white and other wire (red or black) that is connected to the existing fixture.