Various important examples which come up on Shabbos in conjunction with the halachas of perfuming or putting in a nice smell into an item;
Does One Have to Use a Utensil (כלי) or Just Using One's Hands Is Enough for the Melacha;
A few very important points in reference to 'הכנה משבת לחול' (doing an action on Shabbos for a weekday);