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SharePoint Api permission: Sites.Selected
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The Sites.Selected permission allows an app to access only the specific SharePoint sites you explicitly authorize. This provides a much more secure alternative to granting full access across your tenant. See this: https://learn.microsoft.com/en-us/sharepoint/dev/solution-guidance/security-apponly-azuread

1. Create an App Registration with permission Sites.FullControl.All
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!!! Important: This App Registration is not the working app that will access the SharePoint site. It is a helper/admin app, used only to configure and grant SharePoint write permissions to other apps (the real apps that will use Sites.Selected permission).

Start at the Microsoft Azure portal: https://azure.microsoft.com/en-us/features/azure-portal/

Application registration: Go to the App registrations and click on New registration:



The Redirect URI (optional) is not required, because it will has a Application Permission only.

Configure API Permissions:

Navigate to API Permissions. Click on Add a permission button. Select Microsoft Graph. Then select Application Permission. Search for Sites and check the flag Sites.FullControll.All.



Secret key: A new client secret needs to be created as well. Go to the "Certificate & secrets" and generate a new secret key. Click on New client secret.