I am starting using Terraform in the past few weeks.
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Mince -
Judy -
Safdar Ali -
Joshua Matthews -
Top comments (3)
two short advices:
1) use a remote backend Backends, this especially mandatory if you are using terraform with others,
2) use modules whenever possible. Terraform is working on adding more functionality to modules, and with the release of 0.13 (still in Alpha). more functionality will be added, notably using for_each loops.
3) make sure you have a .gitignore file
4) make use of override.tf so you can test it locally. Here you can put sensitive data and in combination with .gitignore it won't be checked in.
5) use terraform validate before checking in
Terraform, and IAC in general, is still pretty new thing so doesn't have as many conventions around as traditional programming.
For someone just getting starting you should definitely checkout Hashicorp Learning Center. It is updated pretty regularly, and material is structured so that it builds up on each other.
Also, I think you should read upon what Terraform really does for you, and what is stored in the files created on initialization. This way, you will understand why remote backend is important. Same with modules. Just start using the tool, and you will come to a case where they are needed.
Anyway, enjoy! Terraform is lot's of fun!