Source Sheet (https://rb.gy/p6ha7l)
Who is allowed to learn in Tisha B'av?
What are you allowed to learn?
Does the regular Chiyuv of learning apply on Tisha B'av or not?
Why are you not allowed to learn on Tisha b'av?
Is Tisha B'av more stringent than an Avel or is it more lenient?
Are you allowed to learn on Erev Tisha B'av after Chatzos?
Can you learn Chassidus as an Avel or on Tisha b'av?
Tisha B'av