</doc>` OAuth 2.0 is a secure protocol designed to provide access delegation without exposing user credentials. However, its implementation can be prone to security flaws if not done correctly. The IETF published RFC 9700: Best Current Practice for OAuth 2.0 Security, which outlines best practices to follow to keep the OAuth implementation safe. These best practices include protecting redirect-based flows by validating redirect URIs carefully, preventing token replay attacks using short-lived access tokens and secure storage, limiting access token privileges, avoiding password-based authentication and the Implicit Grant, using strong client authentication methods, and staying updated on threats and countermeasures. By following these guidelines, developers can ensure that OAuth 2.0 remains a secure choice for delegated access in modern applications.