Hi Khushi,
There is no such concept of Red Forest like we use to have on local AD Infrastructure, if you are looking to leverage Entra AD for authentication and implementing controls for your tenant I will suggest you to explore Entra AD Directory Services, Azure Active Directory Domain Services (Azure AD DS), part of Microsoft Entra, enables you to use managed domain services—such as Windows Domain Join, group policy, LDAP, and Kerberos authentication—without having to deploy, manage, or patch domain controllers.
Compare the different variants - https://learn.microsoft.com/en-GB/entra/identity/domain-services/compare-identity-solutions
Deploy Azure AD DS - https://learn.microsoft.com/en-gb/entra/identity/domain-services/tutorial-create-instance
Security wise you can explore here - https://azure.microsoft.com/en-gb/explore/security
Hope this helps.
JS
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