follow the guide from official documentation to download terraform -

https://www.terraform.io/docs/cli/install/apt.html

1. Initialize terraform directory:

Do terraform init in directories: ec2,iam,networking,RDS,s3,SecurityGroups

2. To get the setup for terraform apply: terraform plan

Open the terminal in the networking directory, then:

1. To create resources:

terraform apply -var-file="./variables.tfvars" 

By default if the variables are not provided: region=us-east-1, profile=dev, vpc_name=csye6225

2. To destroy resources:

terraform destroy -var-file="./variables.tfvars" 

Open the terminal in the SecurityGroups directory, then:

1. To create resources:

terraform apply -var-file="./variables.tfvars" 

2. To destroy resources:

terraform destroy -var-file="./variables.tfvars" 

Open the terminal in the iam directory, then:

1. To create resources:

terraform apply -var-file="./variables.tfvars" 

2. To destroy resources:

terraform destroy -var-file="./variables.tfvars" 

Open the terminals in the s3 and RDS directory, then:

1. To create resources:

terraform apply -var-file="./variables.tfvars" 

2. To destroy resources:

terraform destroy -var-file="./variables.tfvars" 

Open the terminal in the ec2 directory, then:

1. To create resources:

terraform apply -var-file="./variables.tfvars" 

2. To destroy resources:

terraform destroy -var-file="./variables.tfvars"