Sentry can be used to debug front-end errors by utilizing fingerprints, breadcrumbs, tags, and flags. Fingerprints group similar error events together, making it easier to identify and resolve issues. Breadcrumbs provide a trail of events that occurred before the issue, helping to determine the cause of the bug. Tags allow for quick search and observation on how errors impact users, while flags enable recording complex state as additional data. By customizing these properties, developers can gain more visibility into their application's behavior and optimize Sentry's debugging capabilities.