general rule for cases where the yevamah is forbidden to the yavam and the different consequences.

then focussing on specific cases where there is a rabbinic prohibition or there is a need to maintain the sanctity of the kehuna

The case of "the wife of a brother whose world he did not share"

Yevamot 1:3 & 1:4

1:1 & 1:2

diagrams

https://mordmaman.notion.site/1-1-c13f00d7a0a848e784a4a264ef6b48b9?pvs=4

Introduction to Yevamot: General rules of marriage

Introduction to Yevamot: Rabbinic Decrees

Introduction to Yevamot: Exemptions

Introduction 1

Hagiga 3:7 & 3:8

Hagiga 3:5 & 3:6