How do you write code in Terraform?

Terraform configuration is written in HashiCorp Configuration Language (HCL). A typical file starts with a provider block, e.g., provider "aws" { region = "us-east-1" }. You then declare resources: resource "aws_s3_bucket" "example" { bucket = "my-bucket" }. Modules allow reuse of code, variables enable parameterization, and outputs expose values. Terraform manages state in a backend (local or remote), supports a plan/apply workflow, and uses declarative syntax to describe desired infrastructure. You can version your .tf files in Git, run terraform init, terraform plan, and terraform apply to provision resources.