AzureDevOps_TF_AutomatedTestAndDeploy example of stage, job, task

AzureDevOps_TF_AutomatedTestAndDeploy.yml

stages:
- stage: Terraform_Plan  <-- This is a stage definition
  jobs:
  - deployment: Terraform_Plan  <-- This is a job definition
    displayName: Terraform_Plan
    pool: $(pool)
    workspace:
      clean: all
    continueOnError: 'false'
    environment: 'TerraformPlan_Environment'
    strategy:
      runOnce:
      deploy:
        steps:
        - checkout: self  <-- This is a task definition