Here's a guide to decorating a dinner table that's geared to today's lifestyles, when takeout in front of the fireplace counts as having friends over for dinner and a potluck picnic is far more common than a five-course meal. As a nod toward tradition, a basics section reviews the standard tableware components and provides some light-hearted refreshers on traditional put-the-salad-fork-here etiquette. More important, it shows how to assemble an all-purpose...