In the cloud, you don't create "Servers". You create "Resources". Resource Groups act as logical containers to manage lifecycle, billing, and access control for related items.
If you delete a Resource Group, everything inside it is deleted. This is perfect for temporary environments. "Delete the Dev Project" becomes one click.
You can generate a bill filtered by "Tag: CostCenter=Marketing". This tells you exactly how much the Marketing team is spending, separate from Engineering.
Grant permission to the Group, not the individual items. "John is an Admin of the Website Group" automatically gives him access to the VM, Load Balancer, and DB inside.
Mission: The account is a mess. Drag resources into their correct Project Groups.
Bonus: Once a group is full, try the "Delete Group" button to see the power of lifecycle management.