Engineering · FOCUSED GUIDE
Learn Code review.
Review unfamiliar code for correctness, security, and reliability.
YOUR LEARNING PATH
Code review essentials
Start with the essentials or pick the concept you need.
RECOMMENDED NEXTHow do I check correctness?
Start learning01Review reasoningExplore concepts
- How do I check correctness?2 min
- How do I check security?2 min
- How do I check performance?2 min
- How do I check reliability?2 min
- How do I check maintainability?2 min
- Which edge cases and tests matter most?2 min
- What can break in production, and how would I debug it?2 min
- What review comment would I leave?2 min
- How do I spot common React and async bugs?2 min
What you will study in Code review
Focused lessons organized by concept. Start with the explanation, trace the examples, and check your recall before moving on.
Review reasoning
Correctness means the implementation satisfies the required behavior for valid, invalid and concurrent inputs. A review begins with the intended rule, because readable or compilable code can still implement the wrong rule. Trace the inputs, state changes and outputs before judging style.
- How do I check correctness?
- How do I check security?
- How do I check performance?
- How do I check reliability?
- How do I check maintainability?
- Which edge cases and tests matter most?
- What can break in production, and how would I debug it?
- What review comment would I leave?
- How do I spot common React and async bugs?