In an introductory note to this chapter, the Kitzur Shulchan Aruch writes that most Jews are already familiar with the prohibited labors of Shabbos and that he is only addressing common situations with which people may not be familiar. Clearly, the laws of Shabbos constitute an area requiring much greater study than this email alone will allow.
80:43 One may not add saffron to his food on Shabbos because this colors it. (Most authorities disagree with this and are not concerned about the coloring of food – see OC 320:19 and Mishnah Brurah 320:56.)
80:44 On Shabbos, we may not braid or twist even two threads or two detached hairs.