GitHub Copilot Beginner Guide: Coding, Debugging and Review
A coding assistant across editors, GitHub and the command line, helping with completion, explanation, debugging, review and agent-style tasks.
People already reading or changing code who want faster explanation, implementation and review.
A complete non-coder who cannot run tests or assess whether a change is safe.
Use the free tier on one real repository. Pay only after you know which completion, chat or agent workflow repeatedly saves time.
Use it on one real task
A short controlled test tells you more than a long feature list.
- 1
Ask it to explain the current code before changing anything.
- 2
Request the smallest change, risks and tests.
- 3
Review the diff, run tests and check secrets, security and licences.
Do not judge the tool by a polished demo
Use the same acceptance and stop rules on your own material.
Keep testing only if
- Only the requested files and behaviour changed.
- Existing and new tests pass, and the original bug no longer reproduces.
- The diff contains no secret, unknown licence or new security issue.
Do not pay yet if
- You cannot review a diff or run tests and nobody else can help.
- The change affects authentication, payments or production data but is judged only by whether it runs.
- You actually need a no-code site rather than an ongoing code project.
A useful first prompt
Replace the bracketed material with your own information and verify the output.
Do not change the code yet. Explain what this function does, which inputs can fail, the smallest safe change and the tests to add. Wait for approval before editing.
This is a selection guide, not a promise of performance. Access, plans and product features can vary by account, region and date. Check the official website before paying or using output commercially.