Final answer:
The part of Dante Alighieri's epic poem that focuses on the concept of hell is The Inferno. This section describes the journey through the nine circles of hell and the punishments of sinners.
Step-by-step explanation:
The part of Dante Alighieri's epic poem that focuses on the concept of hell is The Inferno. The Inferno is the first part of Dante's Divine Comedy and describes the journey through the nine circles of hell. In this section, Dante encounters various sinners and learns about their punishments based on the sins they committed in life.