This lecture focuses on understanding how to use example 5.12 to distinguish when to close a curve to the left or right. The instructor explains the process step by step, providing clarity on the solution approach. Various courses are referenced, including course 11 and course 12, to illustrate different scenarios. The lecture also touches on the transform method and the importance of separating in two for better results. Students are encouraged to explore more examples and understand the concept of Fourier transform in depth.