Exercise 1: Multi-Cursor Cleanup — Possible Solution
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EXAMPLE FILE
------------------------------
apple
banana
cherry

STEPS
------------------------------
1. Click at the start of the first line ("apple") to place your
   cursor there.
2. Press Ctrl+Alt+Down (Cmd+Option+Down on macOS) twice — this adds a
   cursor at the same column on each of the next two lines, giving
   you 3 cursors total, one at the start of each line.
3. Type "- " (a dash and a space) once. Because all 3 cursors are
   active simultaneously, this single action prepends "- " to every
   line at once:

- apple
- banana
- cherry

4. Press Escape to collapse back to a single cursor, per this
   chapter's own warn-box, before doing any further unrelated
   editing.

WHY THIS WORKS AS AN ANSWER
------------------------------
Ctrl+Alt+Down reuses the chapter's own described shortcut exactly —
it's specifically suited to this kind of task because the three
target lines are CONSECUTIVE, so placing cursors one line at a time
below the first is faster than Alt+Clicking each one individually.

Typing the same text once and having it apply to all three lines
simultaneously is the entire value proposition of multi-cursor editing
the chapter opens with — without it, the same edit would require
either three separate manual edits, or a find/replace operation that
doesn't naturally fit "add this prefix to the start of every line."

Pressing Escape afterward directly applies the chapter's own warn-box
guidance — without it, the next keystroke (even something unrelated,
like starting to type a comment elsewhere) would still apply to all
three cursor positions, a common source of confusing, seemingly
random extra edits.