Learn Terraform from Scratch - 2025

Download VS Code for your OS from code.com and install it, then open extensions, search for Terraform, and install the official HashiCorp Terraform extension.

Learn the Terraform file structure and syntax, including .tf and .tf.json extensions, two base languages, and hll blocks with resource names and attributes.

Master Terraform blocks by using resource blocks to create resources and data blocks to query existing ones, following the syntax of block type, resource type, and unique resource name.

Learn how to pass credentials to providers like AWS, GCP, or Kubernetes using provider authentication configurations, environment variables, or files, avoiding hard-coded secrets.

Learn to use additional options in Terraform commands, concatenate local values with prefixes or suffixes, ensure unique resource names, and run targeted apply or destroy with auto-approve.

Apply Terraform best practices by splitting configurations into focused files (s3.tf, data.tf, output.tf, local.tf), organizing resources by type, and using consistent naming such as camel, snake, kebab, or Pascal case.

Learn how Terraform's resource lifecycle controls create, destroy, and replacement behavior. Use lifecycle blocks like create_before_destroy and prevent_destroy to safely rename resources and retain or replace them as needed.

Terraform uses a state file to track resources and reconcile with the provider, and commands like terraform init and terraform apply update and enforce the recorded state.

Learn how Terraform state locking works with an S3 backend, using DynamoDB for a lock table to prevent concurrent changes, and how to manage, initialize, and release locks.

Discover built-in Terraform functions across numeric, string, and list categories, including upper and lower transforms. Test them in the Terraform console for real-world naming and data handling.

Explore Terraform variables using the variable block, define descriptions, types, and defaults, and reference them as var.name in code, comparing with locals and understanding dynamic input during plan.

Learn how to write dynamic Terraform code using count to create multiple S3 buckets, manage state as an array, reference count.index, and build unique names with local values.

Learn to replace count with for_each in Terraform, handle maps and lists with each.key and each.value, and track renamed resources using mode and moved blocks.

Use a conditional statement in Terraform to create dynamic bucket names and counts based on environment variables. The ternary style chooses values for prod and non prod.

Learn how to use terraform dynamic blocks to efficiently generate multiple security group egress rules from a single variable, using for_each, list of objects, and optional fields.

Master terraform validate to catch syntax errors before init, plan, or apply, and use terraform format with --recursive to format code across nested folders for better linting.

Learn to debug Terraform code by setting TF_LOG to trace, debug, or error, export logs with TF_LOG_PATH, and diagnose plan outputs and expired credentials.

Build a reusable Terraform module for self-service S3 bucket creation, using providers, variables, and locals to create prefixed e- buckets with environment handling.

Learn to consume a Terraform module by declaring a module block with a local source, then init, plan, and apply to create an S3 bucket in an environment.

Enforce provider version constraints at the module level to prevent breakage in multi-region resources, using version ranges and module consumers with terraform init.