Understanding the procedure of DOSH and what exactly makes it one of our melachas.
Understanding the concept of מלאכה שאין צריכה לגופה;
cases where one is adding a color on top of the same color (E.g. black on black, blue on blue, red on red, etc.);...
Preparations for the Week: Different Ways of Handling Dirty Dishes and Cutlery on Shabbos;