Understanding the constructive and destructive part of it (mochaik).
Putting Salt into Cholent, Soup, Etc., and Pieces of Radish, Onion, Garlic, Etc.: Eating Right Away;
ודבר דבר (Dabair Davar): Is One Allowed to Talk About Other Things That Are Not Allowed on Other ימים טובים (Yamim Tovim), for Example,...
Folding Laundry That Might Get Ruined if I Keep It Like That Over Shabbos;