Migrate on-prem AD to azure AD having ADDS

One of our clients was interested in going from IaaS Domain Controller to a PaaS solution in Azure. Active Directory is beyond my abilities, but this is the documentation we were able to provide. Might be helpful.

Road to the Cloud
https://learn.microsoft.com/en-us/entra/architecture/road-to-the-cloud-introduction

Microsoft 365 Cloud-Only Identity
https://learn.microsoft.com/en-us/microsoft-365/enterprise/cloud-only-identities?view=o365-worldwide

Migrate from Federation to Cloud Authentication
https://learn.microsoft.com/en-us/entra/identity/hybrid/connect/migrate-from-federation-to-cloud-authentication

Migrate to Cloud Authentication using Staged Rollout
https://learn.microsoft.com/en-us/entra/identity/hybrid/connect/migrate-from-federation-to-cloud-authentication

Transition to Cloud
https://learn.microsoft.com/en-us/entra/architecture/road-to-the-cloud-migrate

Convert On-Prem AD Connect Sycned Users to Cloud 365 Accounts and Retain Current Password
https://learn.microsoft.com/en-us/answers/questions/843619/convert-on-prem-ad-connect-synched-users-to-cloud