AWS as a whole provides many different services, see documentation. Some key services:

• IAM: For user and permission management (docs)

Some initial setup configuration needed after creating an AWS account, see here. Specific steps are:

Hierarchy of users should follow:

• Root: Rarely accessed except to create more admin users.
• Admins:

1. Login with root user and enable MFA
2. Use IAM to create an admin user