When using a code validator to check your HTML, CSS, or JavaScript code, it's essential to address errors in a systematic manner. The correct approach is to correct the first reported error before revalidating. This method is recommended because often, the first error can cause a cascade of subsequent errors or warnings. By fixing the first error, you may automatically resolve other errors that were reported later.

Reasoning:

Cascading Errors: The first error in the code might lead to multiple subsequent errors. Fixing it can sometimes resolve those cascading errors, reducing the overall number of errors in the next validation.

Logical Flow: Addressing errors in the order they appear maintains a logical flow and makes debugging more manageable.

Steps to Follow:

Step 1: Run the code through the validator.

Step 2: Identify the first reported error.

Step 3: Correct the first error.

Step 4: Revalidate the code to check if the error count has reduced or if new errors appear.

Step 5: Repeat the process until all errors are resolved.

References:

W3C Markup Validation Service

MDN Web Docs - Debugging HTML

W3C CSS Validation Service