Exercise 1: Installing Xcode & Running the Default Template — Possible Solution
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Steps:

1. Open the Mac App Store (or Apple's developer downloads page) and
   install Xcode. This requires a Mac running a real, sufficiently
   recent version of macOS - Xcode does not run on Windows or Linux.

2. Launch Xcode. On first launch, accept the prompt to install
   additional command-line tools and any required components.

3. Choose File > New > Project. Select the "App" template under the
   iOS tab, ensure the interface is set to "SwiftUI" and the language
   is set to "Swift," give the project a name, and save it somewhere
   on disk.

4. In the toolbar's device selector, choose a Simulator device (e.g.
   "iPhone 17"). Press the Run button (the triangular play icon) or
   the keyboard shortcut Cmd+R.

5. Xcode compiles the project and launches the iOS Simulator
   automatically, showing the default app - a single screen
   displaying "Hello, world!" (Xcode's own default template text,
   which may differ slightly by Xcode version) inside a globe icon
   layout.

EXPECTED RESULT: The project builds with no errors, and the
Simulator opens showing the default template's own starting screen -
confirming Xcode, the Simulator, and the SwiftUI toolchain are all
correctly installed and working together, with no code changes
required at all.

WHY THIS WORKS AS AN ANSWER
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This confirms the full real toolchain - Xcode, the Swift compiler, and
the iOS Simulator - is correctly installed and able to build and run a
real SwiftUI app end to end, which is the necessary foundation for
every later exercise in this course.