TERRAFORM VARIABLES WITH EXAMPLES:

provider.tf file:

terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 3.0"
    }
  }
}

# Configure the AWS Provider
provider "aws" {
  region     = "us-west-2"
  access_key = ""
  secret_key = ""
}


# Configure the GitHub Provider
provider "github" {
 token = "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" 
}

Variable number:

variable "usercount" {
  type = number
  description = "This is for demo of number variable"
  default = 3
}

resource "aws_instance" "judith" {
  count = "${var.usercount}"
  ami = "ami-03d5c68bab01f3496"
  instance_type = "t2.micro"
  tags = {
    Name = "judith.${count.index}"
  }
  
}

Variable string:

variable "reponame" {
  type = string
  description = "This is for demo of string variable-judith"
  default = "day3-broad"
}

resource "github_repository" "string variable" {
  name        = "${var.reponame}"
  description = "My awesome codebase"
  private = false
}

Variable list:

variable "users" {
    type    = list
    default = ["devopsschool1", "devopsschool2", "devopsschool3"]
    description = "This is for demo of list variable"
}

variable "gitrepos" {
    type    = list
    default = ["devopsschool1", "devopsschool2", "devopsschool3"]
    description = "This is for demo of list variable"
}

resource "aws_iam_user" "judith" {
  name = "${var.users[0]}"
}

resource "github_repository" "repo1" {
  name = "${var.gitrepos[0]}"
  description = "My awesome codebase"
  private = false
}

resource "github_repository" "repo2" {
  name = "${var.gitrepos[1]}"
  description = "My awesome codebase"
  private = false
}

resource "github_repository" "repo3" {
  name = "${var.gitrepos[2]}"
  description = "My awesome codebase"
  private = false
}

map file

variable "account_name" {
   type = map
  default = {
      "account1" = "devops1"
      "account2" = "devops2"
      "account3" = "devops3"
}
}
resource "aws_iam_user" "iamuser" {
  for_each = var.account_name
  name = "${each.value}-iam"
}
resource "aws_instance" "judith-ec2" {
  ami           = "0fb0225bafc2f76c5" # us-west-2
  instance_type = "t2.micro"
 
  tags = {
    Name = "judith"
  } 
}

boolean file: