Understanding the concept of "מדידה של מצוה" (measuring for a mitzvah).
(Squeezing materials.) how to work with a spill using precut paper towels, napkins, tissues, etc.;
Foods - Putting Cocoa Powder with Milk, Making Soda, Making Seltzer, Ice, and Cases Where It Does Apply to Food;
how to work with a broken toilet seat, sink handles, draw that fell off its track;