What are you allowed to learn on Tisha B'Av in general particularity which Gemaras?
- ואלו מגלחין במועד
- Gittin 55b אמר רבי יוחנן through ... I think almost the bottom of 58a. (Note that the chapter is called "those who are damaged.")
- The minor tractate of Semachot
- Rambam's Laws of the Mourner and his Mourning and corresponding portions of Shulchan Aruch.
- Book of Job
- Other calamitous parts of the prophets