How to use Terraform variables and expressions for reusable configurations: types, validation, tfvars precedence, locals, conditionals, loops and built-in functions with examples.

A step-by-step beginner's guide to writing Terraform code: install the CLI, create main.tf, launch an EC2 instance with init, plan and apply, and make it reusable with variables.

Why teams choose Terraform for infrastructure as code: declarative configs, change previews, multi-cloud providers, reusable modules and state management, explained with real HCL examples.

How Terraform decides the order to create and destroy resources: the dependency graph, implicit attribute references, when depends_on is needed, and how to debug ordering errors.

The complete lifecycle of a Terraform resource: defining it in HCL, reading plan output, applying, updating in place or by replacement, importing and destroying safely.