Understanding the constructive and destructive part of it (mochaik).
Preparations for a Weekday: The Concept in Hachana Known as 'רגיל' (an Action Done Out of Habit and Not to Save Time for After...
(Temporary Ohel) Adding on to an existing temporary roof, overhead shelter;
Part #2. Understanding the concept of "שכר שבת בהבלעה" (shabbos earnings included with weekday earnings).