Defense -- 2nd Hand Play
In this instructional article on defense, our RHO will be leading to the trick (either declarer or dummy is leading to the trick). It won't matter if it is a suit contract or notrump.
The old saying for defense is: "Second Hand Low, Third Hand High." In general, when playing second to the trick, play low. The major exception is "cover an honor with an honor" (which also has exceptions). Don't you just love bridge?