This lesson is a deeper dive into Select and Mask and focuses on refining selections inside the Select and Mask workspace.
It emphasizes:
Viewing your mask on different backgrounds for better precision.
Using the Global Refinement sliders (Smooth, Feather, Contrast, Shift Edge).
Applying Refine Edge Brush for fine details like hair.
Making use of output settings to save the selection as a Layer Mask or new layer.