Best free Terraform learning resources

HashiCorp Learn (official Terraform tutorials) --- hands-on guided tutorials and learning paths for AWS/Azure/GCP, interactive exercises and short videos. Start here for the canonical basics. (HashiCorp Developer)
Terraform documentation (language & CLI reference) --- the reference for HCL, commands, modules, state, backends and best practices. Use this as your ongoing reference. (HashiCorp Developer)

freeCodeCamp.org --- Full Terraform courses / projects on YouTube + companion articles --- long-form beginner courses (AWS / Azure projects) you can follow start-to-finish. Great for a one-sitting deep dive. (YouTube)
(Official vendor channels & HashiCorp’s tutorial videos) --- short demos and recordings embedded inside HashiCorp Learn tutorials. (HashiCorp Developer)

Microsoft Learn --- “Fundamentals of Terraform on Azure” and Azure Terraform labs --- free, step-by-step modules that show Terraform with Azure resources and verified Azure modules. Use these if you’re focused on Azure. (Microsoft Learn)
Google Cloud --- Terraform docs & Cloud Skills Boost labs --- GCP tutorials and hands-on Cloud Skills Boost (Qwiklabs-style) labs to practice Terraform on GCP. (Google Cloud)
HashiCorp tutorials for specific clouds (AWS/Azure/GCP) --- cloud-specific step-by-step tutorials inside HashiCorp Learn. Good companion to provider docs. (HashiCorp Developer)

Terraform Registry (modules & providers) --- browse official and community modules to see idiomatic module layouts and real-world examples. (Terraform Registry)
terraform-aws-modules (GitHub) --- widely used community modules for AWS (VPC, EKS, RDS, etc.) --- good to study and reuse patterns. (GitHub)
terraform-examples & other example repos --- canonical, minimal examples for many providers (Containersolutions / futurice / example repositories). Great when you want copy-pasteable patterns. (containersolutions.github.io)

“Awesome Terraform” / curated lists on GitHub --- aggregated links to blogs, tools, security & testing guidance, and more community resources. Use these once you’re past basics. (GitHub)

Explore tflint, checkov, terrascan, terratest and other community tools --- many blog posts and repos cover these (see curated lists above for links). (Spacelift)

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Start: Do one HashiCorp Learn “Get started” tutorial for your cloud. (HashiCorp Developer)
Watch: Follow a freeCodeCamp full course video while you repeat commands in a cloud sandbox. (FreeCodeCamp)
Practice: Clone a terraform-examples repo and reproduce a simple app (VPC + one VM + storage). (containersolutions.github.io)
Reuse: Study + use a module from the Terraform Registry; adapt it. (Terraform Registry)
Advance: Learn testing, linting and policy (terratest, tflint, policy-as-code). Use the “awesome” lists to discover tools. (GitHub)

Always use the official HashiCorp Learn tutorials first --- they’re up to date with Terraform’s evolving best practices. (HashiCorp Developer)
Work in small, disposable sandboxes (free cloud tiers or provider sandboxes) so mistakes don’t cost you. (Cloud Skills Boost / Microsoft Learn labs are great for this). (Google Cloud Skills Boost)
Read real module code on the Terraform Registry and GitHub --- production patterns live there. (Terraform Registry)

Terraform: What it is and why it's important for cloud engineers