When you start Shmoneh Esrei you take three steps back then three steps forward during the Passuk “Hashem S’fasai Siftach” (doing this is walking during Shmoneh Esrei; the three steps forward should finish before that).
That you need to eat Mezonos to count for a Mezuman (anything but water is fine).
That it’s Assur for kids to run around on Shabbos (see O.C. 301:2).
That even if you don’t clap on Shabbos that you’re allowed to clap with one hand backwards (see O.C. 337 or 339, around there somewhere, and look at the Lashon of the Shulchan Aruch very, very carefully).