Where the term "Kiddushin" comes from: Kiddushin 2b
Whether Kiddushin can be conducted against the bride's will: Gittin 10a; Kiddushin 2b, 9b
The prohibition against kiddushin for a bride who is a minor: Ketuvot 57b
Whether Kiddushin is valid where intercourse will be forbidden: Kiddushin 9b
Conditional Kiddushin: Yevamot 107a; Ketuvot 74a
Where Kiddushin was done conditionally, and then they completed Nisuin without the husband re-mentioning his condition: Yevamot 110a; Ketuvot 72b-74b
Where Kiddushin was done with one woman conditionally, and then he completed Nisuin with a second woman without re-mentioning his condition: Ketuvot 73b-74a
What happens if there was a negative circumstance that the wife thought she could accept at the time of the wedding, but that she later realizes she can't accept, such as a physical defect (mum) in the husband?: Ketuvot 70b