[ayacoe]

They talk a little in the article about how the Inferno was more based in earthly things than the the later two books, and that makes it easier to approach.

I think the reason why the Inferno is solely taught is becaue it's just so long a text, and the characters Dante interacts with in his descent are more familiar to an early student of the classics than the later volumes.

I would absolutely recommend reading Purgatorio and Paradiso if you have a chance. Though it's long, it's quick reading, and sublime is an understatement.