main.tf

provider "aws" {

    region     = "eu-west-3"
}

variable "subnet_cidr_blocks" {
  description = "Subnet cidr blocks"
  type = list(string)
}

variable "vpc_cidr_block" {
  description = "VPC cidr block"
  type = string
}

resource "aws_vpc" "my_vpc" {
  cidr_block = var.vpc_cidr_block
  tags = {
    Name: "Terraform-made"
  }
}

resource "aws_subnet" "subnet-1" {
    vpc_id= aws_vpc.my_vpc.id
    cidr_block = var.subnet_cidr_blocks[0]
    availability_zone = "eu-west-3a"
}

data "aws_vpc" "existing_vpc" {
    default = true
}

resource "aws_subnet" "subnet-2" {
    vpc_id = data.aws_vpc.existing_vpc.id
    cidr_block = "172.31.200.0/24"
    availability_zone = "eu-west-3b"
    tags = {
        Name: "Terraform-made-subnet"
    }
}

output "vpc-id" {
  value = aws_vpc.my_vpc.id
}

output "subnet-id" {
  value = aws_subnet.subnet-1.id
}