Explanation
References:https://docs.cloud.oracle.com/iaas/Content/General/Concepts/regions.htm#one

Explanation
When creating a compartment, you must provide a name for it (maximum 100 characters, including letters, numbers, periods, hyphens, and underscores) that is unique within its parent compartment. You must also provide a description, which is a non-unique, changeable description for the compartment, from 1through 400 characters.
After creating a compartment, you need to write at least one policy for it, otherwise no one can access it (except administrators or users who have permissions set at the tenancy level). When creating a compartment inside anothercompartment, the compartment inherits access permissions from compartments higher up its hierarchy.
When you create an access policy, you need to specify which compartment to attach it to. This controls who can later modify or delete the policy. Dependingon how you've designed your compartment hierarchy, you might attach it to the tenancy, a parent, or to the specific compartment itself.

Explanation
References:https://blogs.oracle.com/cloud-infrastructure/migration-and-disaster-recovery-in-the-oracle-cloud-wi

Explanation
https://docs.cloud.oracle.com/iaas/Content/Network/Tasks/managingVNICs.htm