Here are five ways to protect Active Directory from hackers:

1. Use strong and unique passwords: It is important to use strong, unique passwords for all accounts in Active Directory, including administrator accounts. You should also enable password complexity and password expiration policies to help ensure that strong passwords are being used.
2. Enable two-factor authentication: Two-factor authentication (2FA) requires users to provide an additional form of authentication, such as a security token or one-time code, in addition to their password. This helps to protect against password-based attacks and can significantly increase the security of your Active Directory environment.
3. Use Group Policy Objects (GPOs) to implement security policies: GPOs can be used to enforce security policies across your Active Directory environment, such as setting password complexity requirements, disabling insecure protocols, and restricting access to certain resources.
4. Regularly update and patch your systems: It is important to keep all systems, including your Active Directory infrastructure, up to date with the latest patches and security updates. This helps to protect against known vulnerabilities that could be exploited by hackers.
5. Monitor and audit your Active Directory environment: Regularly monitoring and auditing your Active Directory environment can help you identify potential security issues and take appropriate action to address them. You should also consider implementing a security incident and event management (SIEM) solution to help you monitor and analyze security events in real-time.