Why This Matters

Tutorials end, but projects stick. Building something small from scratch with Copilot cements the basics and surfaces where you'll need to grow. This is the bridge between lessons and real use.

Concept Explained

A checkpoint project combines everything you've learned into one end-to-end build. The deliverable is small (30–80 lines), useful, and exercises inline completions, Chat, and at least one slash command.

How It Works

Pick a small utility. Set a 30-minute timer. Use Copilot for every step: scaffolding, implementation, tests, docs. Track where Copilot helped and where it struggled. Reflect in writing at the end.

Step-by-Step Tutorial

1. Pick a utility

2. Scaffold with /new

3. Implement with completions

4. Add tests with /tests

5. Document with /doc

6. Reflect

Real-World Example

A self-taught developer built a markdown link checker in 25 minutes using Copilot for the file-walking logic, the regex, and the test suite. They reflected: 'Copilot nailed the regex but struggled with the cross-platform path handling — I had to iterate twice.' That reflection pointed them to BE-42 (Shell scripting with Copilot) as the next lesson.

Example Prompts / Commands / Code

// crypto.js utility
function shorten(url) {
  // Copilot suggests:
  const hash = Math.random().toString(36).substring(2, 8);
  return \`https://short.io/\${hash}\`;
}

// Tests (via /tests):
test('shorten returns a string', () => {
  expect(typeof shorten('https://example.com')).toBe('string');
});

Common Mistakes

• Picking too big a project — keep it under 80 lines.
• Skipping the reflection — the friction log is the real deliverable.
• Not using slash commands — try at least /tests and /doc.
• Perfecting the code — ship a working version, then iterate.

Best Practices

• Set a 30-minute timer to force focus.
• Use all three surfaces: inline, Chat, slash commands.
• Track every iteration — count them as data.
• Reflect in writing immediately after finishing.

Troubleshooting

Practical Exercise

Professional Challenge

Frequently Asked Questions

Further Reading

• GitHub Copilot quickstart

Official References

• Quickstart

Related lessons: BE-15, BE-43