הכנה ליום אחר (Preparations for a Weekday): Sleeping on Shabbos to Do Work or a Mitzvah on Motzi Shabbos;
Understanding the procedure of DOSH and what exactly makes it one of our melachas.
Foods - Putting Cocoa Powder with Milk, Making Soda, Making Seltzer, Ice, and Cases Where It Does Apply to Food;