Which section of Mahabharat is considered as Didactic section?

Bhagvad Gita

The most important didactic section of the Mahabharata is the Bhagavad Gita, which contains the advice/instruction offered by Lord Krishna to Arjuna.

Historians typically categorize the content of the present text into two main categories: the narrative, which comprises stories, and the didactic, which contains prescriptions about social norms. Although this division is not rigid, as didactic sections may include stories and the narrative might convey social messages, it is generally accepted among historians that the primary intent of the Mahabharata was to serve as a captivating and emotional drama. The didactic portions, believed to have been added at a later stage, supplement the epic with moral and ethical teachings, enriching its overall significance.