Implementing Single Sign-On (SSO) effectively is crucial for businesses targeting enterprise customers, but it can be a complex project with serious security consequences if not done correctly. To ensure a secure and seamless SSO experience, consider implementing best practices such as proper session management, ensuring authentication comes from trusted identity providers, requiring Multi-Factor Authentication (MFA), complementing SSO with automated provisioning, replacing email verification with domain verification, dynamically hiding the password field, enforcing granular access control, considering real-time monitoring and logging, staying compliant with industry regulations, encrypting data in transit, adding social logins to your SSO strategy, managing certificate renewal for SAML best practices, implementing deep linking, using Just-In-Time user provisioning, avoiding common SAML security vulnerabilities, and utilizing OAuth 2.0 best practices such as validating tokens, using token encryption, handling tokens securely, using short-lived tokens, and limiting scope of access to avoid potential security risks. By following these guidelines, businesses can create a robust and secure SSO solution that protects user data and enhances the overall user experience.