The difference between one letter or two letters; writing with a "SHINUI" (not the usual manner).
One letter on top of another letter.
Planting or Walking with Wet Peios/Raincoats over Grass; How to Handle Very Wet Grassy Ground;
Understanding the rabbinical restrictions of KOSAIV/MOCHAIK.
The Halachas of Putting Items on and Taking Items off a 'Tree';