How to work with solids and liquids that were put together on "erev" Shabbos.
understanding the concept of מטה של פרקים (a bed used to travel that had to be put together and taken apart);
What Type of Actions Are Not Allowed as a דרבנן (Rabbinical Decree) of Zoreh;
what might be some of the problems that could arise with opening up CANS on Shabbos;