Introduction: What are the laws of Tisha B’Av? What are the customs when Tisha B’Av falls on a Sunday/Motzei Shabbat?
The Main topic: What do the ten generations between Adam and Noach listed in the Torah, Parashat Bereishit, come to teach us?
Rabbeinu Yona teaches us an essential lesson about history of Jewish exile, based on the way the Torah describes the list of the ten generations between Adam and Noach, and the significance of that list.