Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
Please note that Azure does not allow you to create a VM without having a VNET. And once created, you cannot change the VM of a VNET.
More details on VNET can be found on: What is Azure Virtual Network?
- This is just like a local network
- The benefit with Azure is you have Subnets withing VNET for grouping VMs/resources
- Also, a VNET is essential if you are planning to connect your Azure Environment to OnPrem (Either via VPN or ExpressRoute)
Should you have any specific questions, please do let us know.
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Original posters help the community find answers faster by identifying the correct answer.
Cheers,
Kapil