Open Chrome DevTools by pressing F12 on Windows/Linux or Cmd+Option+J on Mac. The Console tab displays JavaScript errors, warnings, and other logged messages. Errors show up in red text with an X icon, warnings in yellow, and regular logs in white or blue. Each error includes a stack trace — click the file name on the right to jump to the exact line of code that triggered it. This is critical when debugging tracking tags, form submissions, or any script-based functionality. You can filter messages by type using the dropdown menu (Errors, Warnings, Info) or search for specific terms in the filter box. For tracking and analytics work, console errors often reveal why a tag isn't firing. Common culprits include blocked third-party scripts (check the Network tab for red failed requests), Content Security Policy violations, or typos in custom event code. If you're implementing GTM or Facebook Pixel and conversions aren't registering, the Console will usually tell you if a script failed to load or threw an exception. Right-click anywhere on the page and select Inspect, then navigate to Console if F12 doesn't work on your system. On client sites we audit, we routinely check Console across key pages — homepage, product pages, checkout — because a single uncaught error can break conversion tracking or lead capture forms. Errors don't always mean visible breakage; sometimes a script fails silently but stops your analytics from recording sessions. Preserve log (checkbox at top of Console) is useful when debugging redirects or multi-page flows. It keeps error messages visible even after navigation. For persistent issues, hard refresh with Cmd+Shift+R or Ctrl+Shift+R clears the cache and reloads scripts, which can expose errors masked by cached versions. The Console is your first diagnostic tool for anything script-related — ignore it at your own risk when tracking or user interactions mysteriously stop working.