Terraform and IaC - creating EC2 Instance

I'm revisiting the post I did and creating the same EC2 instance using Terraform instead of going through the AWS Console.

I used the reference from Terraform's Registry to create my HCL script: aws-instance documentation

Here is my main.tf file that I created.

terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = ">= 4.49.0"
    }
  }

  required_version = ">= 1.2.0"
}

provider "aws" {
  region = "us-east-1"
}

resource "aws_instance" "spring_boot_webserver" {
  ami           = "ami-0b5eea76982371e91"
  instance_type = "t2.micro"

  tags = {
    Name = "iac-java-webapp"
  }

  key_name = "java-demo-keypair"

  associate_public_ip_address = true
  subnet_id                   = "subnet-01b088baff86159af"
  vpc_security_group_ids = [
    "sg-0a5cddc1e38f7b9b5"
  ]
}

It was pretty cool to go into my AWS Console (after waiting about 30 seconds) and seeing the EC2 Instance that was created by running my Terraform script: