We will be having the variables.tf, ec2securitygroups.tf, ami-datasource.tf, ec2instance.tf, outputs.tf where the respective values will be defined

Variables.tf :

variable "aws_region" {
    description = "Region in which AWS Resources to be created"
    type = string 
    default = "us-east-1"

}

#AWS EC2Instance Type
variable "instance_type" {
    description = "EC2 Instance Type"
    type = string
    default = "t2.micro"
    }

#AWS EC2 Instance Key Pair
variable "instance_key_pair" {
    description = "AWS EC2 Key Pair that need to be associated with EC2 instance"
    type = string
    default = "terraform"
}

Versions.tf :

# Terraform Block
terraform {
    required_version = "~> 1.0.11"
    required_providers {
        aws = {
            source = "hashicorp/aws"
            version = "~> 3.0"
        }
    } 
}

#Provider Block
provider "aws" {
    region = var.aws_region
    }

EC2securitygroups.tf :

resource "aws_security_group" "vpc-web" { 
  name        = "vpc-web"
  description = "Test VPC WEB"
    ingress {
    description      = "allow port 80"
    from_port        = 80
    to_port          = 80
    protocol         = "tcp"
    cidr_blocks      = ["0.0.0.0/0"] 
      }
 
ingress {
    description      = "allow port 443"
    from_port        = 443
    to_port          = 443
    protocol         = "tcp"
    cidr_blocks      = ["0.0.0.0/0"] 
      }
  egress {
      description = "Allow IP and ports outbound"
    from_port        = 0
    to_port          = 0
    protocol         = "-1"
    cidr_blocks      = ["0.0.0.0/0"]
      }

  tags = {
    Name = "vpc-web"
  }
}

ami-datasource.tf :

#Get latest AMI ID for Amazon Linux2 OS

data "aws_ami" "amzlinux2" { 
  most_recent      = true 
  owners           = ["amazon"] 
  filter {
    name   = "name"
    values = ["amzn2-ami-kernel-5.10-hvm-*-gp2"] 
  }

  filter {
    name   = "root-device-type"
    values = ["ebs"]
  }

  filter {
    name   = "virtualization-type"
    values = ["hvm"]
  }

  filter {
    name = "architecture"
    values =  ["x86_64"]
  }
}

EC2instance.tf :

resource "aws_instance" "myec2vm" {
    ami = data.aws_ami.amzlinux2.id 
    instance_type = var.instance_type 
    key_name      = var.instance_key_pair 
    ##Now next thing in vpc_security group id
    vpc_security_group_ids = [aws_security_group.vpc-ssh.id, aws_security_group.vpc-web.id] 
        provisioner "remote-exec" {
    inline = [
        "sudo yum update -y",
        "sudo yum install -y httpd",
        "sudo systemctl enable httpd",
        "sudo service httpd start",
        "sudo echo '

Welcome to Infra Xpertzz - Apache-install
' | sudo tee /var/www/html/index.html",
"sudo mkdir /var/www/html/webserver1",
"sudo curl http://169.254.169.254/latest/dynamic/instance-identity/document -o /var/www/html/webserver1/metadata.html",
]
connection {
type = "ssh"
user = "ec2-user"
private_key = file("./terraform.pem")
host = self.public_ip
}
}
tags = {
"Name" = "EC Demo 1"
}
}

outputs.tf :

# Terraform Output Values
#EC2 Instance Public IP
output "instance_publicip" {
    description = "EC2 isntance Public IP"
    value = aws_instance.myec2vm.public_ip
}

#EC2 Instance Public DNS
output "instance_publicdns" {
    description = "EC2 isntance Public IP"
    value = aws_instance.myec2vm.public_dns
}