Challenge 1: Applying a Real Wood Grain Photo to a Table's Surface — Solution Walkthrough

The answer:

Per this chapter's own material, an Image Texture node accomplishes
this. It reads an actual 2D image file and maps it across the 3D
surface, feeding its own color output directly into the Principled
BSDF's own Base Color input — replacing a single flat color with real
surface detail from the photographed wood grain image.

Why this specifically relies on Chapter 4's own UV unwrapping:

Per this chapter's own material, the Image Texture node uses the
mesh's own UV coordinates to correctly map that image across the 3D
surface. Without the UV unwrapping covered in Chapter 4, there would
be no defined mapping telling the node which part of the flat wood
grain image should land on which part of the table's own curved or
flat surfaces.

Why this is a genuine step up from Blender Fundamentals' own material:

Per this chapter's own comparison table, Blender Fundamentals' own
Chapter 6 only supported solid colors, with no equivalent way to apply
an actual photographed image across a surface — this is exactly the
kind of real texture support this chapter's own Shader Editor adds.

WHY THIS WORKS AS AN ANSWER
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This exercise checks that applying a real image texture is correctly
matched to the Image Texture node, and that its dependency on Chapter
4's own UV unwrapping is understood clearly.