Terraform follows adeclarativeapproach, meaning it ensures the infrastructure matches the configuration.
If you run terraform apply againwithout any changes, Terraform willdetect that the infrastructure is already up to dateand willdo nothing.
The command will complete successfully with the message"No changes. Your infrastructure matches the configuration." Official Terraform Documentation Reference:
Terraform Apply - HashiCorp Documentation

terraform state listonly displays resources stored in the state filebut doesnot interact with the cloud provideror refresh the state.
terraform plan, terraform apply, and terraform destroycompare or modify the infrastructure, so theyrefresh the stateto ensure accuracy.
Official Terraform Documentation Reference:
terraform state list - HashiCorp Documentation

This is the command that can add existing resources into Terraform state, by matching them with the corresponding configuration blocks in your files.

To import the contents of a local file as a string in Terraform, you can use the built-in file function. By specifying file("id_rsa.pub"), Terraform reads the contents of the id_rsa.pub file and uses it as a string within your Terraform configuration. This function is particularly useful for scenarios where you need to include file data directly into your configuration, such as including an SSH public key for provisioning cloud instances.Reference = This information is a standard part of Terraform's functionality with built-in functions, as outlined in Terraform's official documentation and commonly used in various Terraform configurations.

This command will check if all code in a Terraform configuration that references multiple modules is properly formatted without making changes, and will return a non-zero exit code if any files need formatting. The other commands will either make changes, list the files that need formatting, or not check the modules.