Beyond Auto-Complete
Most developers only use Copilot for basic code completion. In 2026, Copilot is capable of multi-file refactoring, generating entire test suites, creating documentation, explaining legacy code, and suggesting architecture improvements.
Mastering Prompt Engineering for Code
Copilot responds to high-quality comments. A good prompt specifies the function purpose, inputs, outputs, error handling needs, and performance requirements.
The more context and constraints you provide, the better Copilot output.
Test Generation Made Easy
Write a comment above any function requesting tests, and Copilot generates comprehensive test cases including edge cases, error conditions, and expected outputs.
Specify the testing framework for better results.
Copilot Chat for Debugging
Select code and ask Copilot Chat what it does, to find bugs, optimize for performance, or add error handling.
Copilot Chat maintains context about your entire project, not just the open file.
Best Practices for Production
Always review Copilot-generated code for security issues. Use suggestions as a starting point, not a final product. Keep comments up to date for relevant suggestions.