Bhagavad Gita, Chapter 13, Verse 4

What the Kshetra is, what its properties are, what are its modifications, what effects arise from what causes, and also who He is and what His powers are, that hear from Me in brief.

Krishna lays out a real, specific plan here before actually teaching, what will be covered and in what order.

Naming the field's nature, its origin, and the knower's powers upfront gives Arjun a real structure to follow. Nothing about what's coming is left unclear.