What are the main rules and criteria you follow when performing code reviews?

In code review, I pay attention to the following main points:

• Readability and clarity: the code should be easy to understand, with clear variable and function names.
• Compliance with coding standards: adherence to accepted standards and conventions in the project.
• Logic and correctness: ensuring the code does what it claims, without errors and bugs.
• Optimization and performance: avoiding unnecessary calculations and resource usage.
• Error handling: proper management of exceptions and errors.
• Testability: the code should be covered by tests or easily testable.
• Security: absence of vulnerabilities and potential issues.

For example, if I see a long function, I suggest breaking it into smaller parts to improve readability and maintainability.