Two aspects of Shabbos [preceding and following the week]
Shabbos in each of the Luchos [why is כאשר צוך in the second dibros only?]
Havdala with fire [why does the Gemara say that Adam was בדוגמה של מעלה when he lit the fire?]
The special din Mumar on Shabbos [why isn't someone a Mumar if he doesn't eat matza for denying יציאת מצרים as he is for being מחלל שבת for being כופר במעשה בראשית].
And MUCH MORE!!!
