Rav Elchonon Wasserman's Kobetz Shiurim contains a work called Divrei Sofrim. In a clear manner, R' Elchonon tackles many important topics, from where's the source of the rabbis' powers, to how they get exact measurements. A monumental work translated in English for the first time. Designed for the Bal Habayis who would like to relive some of his yeshiva years.