Start with the objects you'll touch every day. You'll create user accounts in the Microsoft Entra admin center, manage their properties, assign licenses so they can actually use Microsoft 365 services, build security groups for access control, and invite an external user to collaborate as a guest.
Secure the way users sign in. You'll turn on self-service password reset so users can unlock themselves, then build Conditional Access policies that require multifactor authentication and respond to risky sign-ins — the same controls Microsoft recommends for every tenant.
Stop handing out permanent admin rights. You'll use Privileged Identity Management to make a user eligible for a directory role, walk through the activation request as that user, and see how just-in-time access shrinks your standing admin footprint.
Make the tenant yours. You'll add and verify a custom domain so users sign in with your company name instead of onmicrosoft.com, then deploy Microsoft Entra Domain Services to give legacy apps and servers the Kerberos, NTLM, and Group Policy support they still expect — without running your own domain controllers.