The step-by-step acceptance of Purim as a holiday: Megillah 7a
Whether one is required to recite the Hallel prayer of praise to Gd: Megillah 14a
Considering the Reading of the Purim Story to be equivalent to Reading the "Hallel" praise to Gd: Megillah 14a Fasting on Purim: Eruvin 41a; Rosh HaShanah 19b; Megillah 5b; Taanit 15b
Fasting on Purim, if it is celebrated on a later date than the 14th of Adar [because the 14th is Shabbat]: Megillah 5a
Fasting on Purim in a year with 2 months of Adar: Megillah 6b
Speaking about the issues of Purim on Shabbat: Megillah 4a
Speaking about the issues of Purim on Purim: Megillah 4a
Travelling for pleasure: Megillah 5b
General work on Purim: Megillah 5b
Whether the prohibition against work on Purim was accepted or not: Megillah 5b
Planting on Purim: Megillah 5a-b
Fasting or working on Purim, if he is in a town which celebrates it on a different day than his hometown: Megillah 5b Rav successfully cursing someone's efforts at planting flax on Purim: Megillah 5b