Challenge 1: Applying and Modifying Heading 1 — Solution Walkthrough

Steps:
  1. Type three section titles, each followed by a short paragraph
     (e.g. "Introduction" + body text, "Methodology" + body text,
     "Results" + body text).
  2. Click into each title paragraph in turn and click "Heading 1"
     in the Styles gallery (Home tab). Repeat for all three.
  3. View > Navigation Pane.
  4. Right-click "Heading 1" in the Styles gallery > Modify > change
     the font colour > OK.

Expected result:

After step 3, the Navigation Pane shows all three titles listed as
an outline — clicking any one jumps straight to that section.

After step 4, ALL THREE titles change colour simultaneously, the
instant the style's definition is confirmed — no need to reselect or
individually reformat any of them.

WHY THIS WORKS AS AN ANSWER
------------------------------
Applying Heading 1 to all three titles tags them with a shared,
named style — Word recognises each one as a structural heading, which
is exactly what makes them appear in the Navigation Pane's outline at
all. Modifying the Heading 1 style's own definition (rather than
selecting each title and manually recolouring it) changes the single
shared definition every tagged paragraph reads from, so every
paragraph using that style updates together — the identical mechanism
to Excel Fundamentals Chapter 6's Cell Styles, just applied to
paragraphs here instead of cells.

Notes:
- If any of the three titles had instead been formatted with direct
  bold/colour changes rather than the actual Heading 1 style, it
  would neither appear in the Navigation Pane nor update when Heading
  1's definition was modified — exactly the gap Exercise 2 explores.