Tell me, please, which means "Trod the boards"--> Tell me, please, what does "trod the boards" mean?
One meaning of the verb tread (tread, trod, trodden) is "to walk over." So, "trod the boards" literally means to "walk over the boards."
According to THE NEW PENGUIN DICTIONARY OF THE THEATRE, boards are "The constituent parts of a stage floor, variously supported by vertical posts, tie-bars, or bracing. Hence the phrase 'tread the boards', meaning acting in general" (p. 74).
An old-fashioned way for an actor to say good-bye to a fellow actor after a production run is to say, "Till next we trod the boards." But I've never actually heard anyone say this.