GH-300: Copilot Basics & Usage
Copilot Basics & Usage is one of the skill areas tested on the GitHub Copilot (GH-300) exam. Below are free GH-300 practice questions with worked answers and a concept diagram — each with a plain-language explanation. Practice the first 10 questions of GH-300 free, no signup.
The concept, in one picture
2 free GH-300 Copilot Basics & Usage questions
A team plans to accept GitHub Copilot output with little review. Which two risks are most associated with depending heavily on Copilot-generated code? (Each correct answer presents part of the solution. Choose two.)
- ✓ Copilot might introduce security vulnerabilities by proposing code that contains known exploits.
- Copilot slows developers down by forcing them to spend excessive time on prompt engineering.
- ✓ Copilot's suggestions may lag behind current best practices or the latest coding standards.
- Copilot lengthens delivery time because its suggestions are usually irrelevant.
Two genuine risks stand out: Copilot may surface code carrying known security vulnerabilities, and its output does not always reflect the newest best practices or standards, so it still needs human review.
- Claims that Copilot always slows velocity or usually produces irrelevant suggestions overstate the downside and are not the recognized risks.
How does the "Fill-In-the-Middle" (FIM) technique change the way GitHub Copilot produces suggestions?
- It limits Copilot to pulling suggestions only from external databases.
- It has Copilot look only at the code before the cursor (the prefix).
- It disregards the surrounding code entirely and relies solely on comments.
- ✓ It uses both the code before and after the cursor (prefix and suffix) to fill the gap more accurately.
FIM lets Copilot read the context on both sides of the cursor — the prefix and the suffix — so it can generate a more accurate completion for the missing middle portion, rather than reasoning from the preceding code alone.
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