Moving muktzah - when and how can you manage that? When you need the space where the muktzah item is, or when you need the muktzah item for a non-muktzah use. Examples include straw and a press, depending on the rest of the circumstances. Also: Scraping mud off your shoes with a tool... as long as the shoes are new. Similarly, how one can use oil as a moisturizer without working the shoe leather, or the leather of a covering akin to tanning. Plus: Don't go out wearing shoes that are way too big, lest you come to taking them off and carrying them in the public domain. Likewise, a woman should not go out wearing a torn shoe, lest she remove them and carry in the public domain, to avoid disgrace. And: Don't go wearing new shoes on Shabbat - if you're a woman - lest they be uncomfortable, and you come to carry them in the public domain. But if you break them in before Shabbat, you remove the risk if taking them off and carrying in the public domain. Also: Starting Chapter 21 - the first mishnah sets us up for going forward: working around muktzah issues, plus some terumah.