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From what I understand, App Registrations encapsulate the App ID, Credentials/Certificates, Scope, and that Service Principals encapsulate management of consent, scopes and other instances must be created when using the application in other tenants whilst they all point to the original App Registration and where it was ...

In the Azure portal, select Azure Active Directory in the left pane and select App registrations and click on New registration. In the Register an application page, enter your application's registration information: In the Name section, enter a meaningful application name that will be displayed to the users.

An Azure service principal is an identity created for use with applications, hosted services, and automated tools to access Azure resources. This access is restricted by the roles assigned to the service principal, giving you control over which resources can be accessed and at which level.

A service principal in Azure is a type of security identity used by applications, services, and automation tools to access resources and perform operations in Azure. In addition to service principals, Azure knows two other types of service accounts: managed identities and user accounts employed as service accounts.

Registering an app in Azure Active Directory provides you with Application ID and Redirect URI values that ISVs can use in their client application's authentication code.

App registration allows you to connect your Apps into your Microsoft 365. Using which you can make use of the enhanced authentication, authorization, RBAC, etc . Explore below the blog to know more about Azure App registrations, covering how to register, configuring API permissions, grant admin consents, and many more.

Registering your application establishes a trust relationship between your app and the Microsoft identity platform. The trust is unidirectional: your app trusts the Microsoft identity platform, and not the other way around. Once created, the application object cannot be moved between different tenants.