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You can decide how to allocate your resources to resource groups based on what makes sense for you and your organization. A resource group is a logical container to hold related resources for an application or group of applications. These tips should be considered when making decisions about your resource group:

 As noted before, all of the resources in a group should have the same lifecycle.

 A resource can only be assigned to one group at a time.

 A resource can be added to or removed from a resource group at any time. Note that every resource must belong to a resource group, so if you remove it from one group, you have to add it to another.

 Most types of resource can be moved to a different resource group at any time.

 The resources in a resource group can be in different regions.

 You can use a resource group to control access for the resources therein.

Source of Information : Microsoft Azure Essentials Fundamentals of Azure Second Edition