of using ARM templates for creating cloud infrastructure?

ARM templates are Infrastructure-as-Code (IaC) for Azure. 

It has many benefits, some of which are:

• track infrastructure in source control like GitHub

• reusable infrastructure so you can create environments easily e.g. copy/paste 

• reduce environment parity by creating similar architecture in multiple environments 

• reduce human error 

• quickly deploy infrastructure changes

• abstract dependency management away 

Here are more reasons:

https://cloud.netapp.com/blog/azure-cvo-blg-azure-resource-manager-arm-benefits-and-best-practices