The requirement for a room to be dark during intimacy and the source and idea behind this halacha

Why voluntary/vowed offerings may not be brought on YomTov in contrast to offerings that are 50% Jewish-owned- the concept of Hashem's table

The story of Hillel the Elder and the students of Beit Shammai on Yom Tov in the Beit Hamikdash

The Torah prohibition of bal te'acher to not delay in bringing a voluntary offering and its connection to shalosh regalim

Going in a mikvah on Shabbat, Yom Kippur, Tisha Bav- application to contemporary times

Cooking/Baking in a pot on Yom Tov the full amount when one only needs a portion of the contents- application to carrying and smoking cigarettes on Yom Tov

The neshama yeteira/extra soul we are granted to have on Shabbat- the spiritual and physical sides of this soul

A person's income is decided during the Aseret Yemei Teshuva

The rules of grinding spices and salt on Yom Tov and application to grinding potatoes and preparing charoset for Pesach

The principle of melechet machshevet on Shabbat and compared to other halachot - application to physical and spiritual mishkan