Exercise 2: Closing Windows vs. Quitting an App — Possible Solution
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WHY "I CLOSED EVERY WINDOW" DOESN'T MEAN "THE APP IS QUIT"
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Per this chapter's warn-box, clicking the red traffic-light button only closes that particular window - it does not quit the application. The app itself keeps running in the background, and its Dock icon keeps showing the "running" dot, even after every one of its windows has been closed. This is a genuinely different model from Windows 11, where closing the last open window very often does end the app.

THE TWO WAYS TO ACTUALLY QUIT AN APP
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The chapter names two explicit ways to quit rather than just close: pressing Cmd+Q while that app is active, or right-clicking (Control-clicking) its icon in the Dock and choosing Quit from the menu that appears.

WHY THIS MATTERS IN PRACTICE
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A colleague who assumes closing windows is equivalent to quitting could end up with many apps quietly running in the background indefinitely - not a crash or a bug, just the ordinary, expected result of macOS's own window-vs-application model, which this chapter explicitly frames as something to unlearn from Windows rather than something wrong with the colleague's Mac.

WHY THIS WORKS AS AN ANSWER
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It correctly explains that closing a window and quitting an app are two separate actions on macOS, gives the concrete reasoning (the app keeps running until told otherwise), and correctly names both Cmd+Q and the Dock right-click/Quit path as the two ways to actually end the app.