RunWithElevatedPrivilege, AllowAppOnlyPolicy, Delegate Control, EnsureUser

Run with elevated privilege runs in which account?

https://social.technet.microsoft.com/Forums/en-US/34b12f22-4348-4b11-a684-3d8be026a367/run-with-elevated-privilege-runs-in-which-account?forum=sharepointgeneralprevious

AllowAppOnlyPolicy

https://dannyjessee.com/blog/index.php/tag/csom/

https://docs.microsoft.com/en-us/sharepoint/dev/solution-guidance/app-only-elevated-privileges-sharepoint-add-in

Delegate Control

https://www.youtube.com/watch?v=iYwowtKWo4w
https://techsnips.io/snips/delegating-access-to-create-users-in-active-directory-using-powershell-and-the-dsacl-module/?page=8

EnsureUser
https://docs.microsoft.com/en-us/previous-versions/office/sharepoint-server/ms473422(v%3Doffice.15)