Challenge 1: Moving an Object Exactly 3 Units Along the Y Axis — Solution Walkthrough

The answer:

Per this chapter's own material, precise transforms are done through
numeric input rather than dragging by eye. Pressing G (Move), then Y
to constrain the movement to the Y axis, then typing 3 and confirming
moves the object exactly 3 units along Y — no approximate dragging
involved at all.

Why constraining to the axis matters here:

Without constraining to Y specifically, a numeric entry could be
ambiguous or apply to the wrong direction. Pressing the axis key right
after the transform shortcut tells Blender exactly which axis the
typed number should apply to, giving an unambiguous, exact result.

Why this is more reliable than dragging:

Dragging the object by eye risks landing at an approximate distance
rather than exactly 3 units — a real problem whenever precise spacing
or alignment actually matters. Numeric input removes that
approximation entirely, producing an exact, repeatable result.

WHY THIS WORKS AS AN ANSWER
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This exercise checks that an exact transform requirement is correctly
matched to numeric input combined with an axis constraint, rather than
an approximate manual drag.