Ketubot 81: Mishnaic Good Advice

[Shanah tovah! This episode is for Sunday, September 25, Erev Rosh Hashanah] Who said halakhot were to be derived from the language of the ketubah? The mishnah connects the ketubah issues to that of sotah - the case of a woman suspected of adultery. The comparison leads to a dispute between Beit Hillel and Beit Shammai, regarding the terms of one's ketubah. Also, the question of whether a yevamah can collect her ketubah from the first husband while the yavam is alive? What would it mean for that money to be available? Moreover, how would everyone feel if that were put into practice? The mishnah is treated as important good advice.