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One thing you might try is running https://terraform-docs.io/ against each module. You can generate markdown that more or less tells you the inputs and outputs for each module so you don't have to go hunt them down if the module authors have scattered their declarations around the different .tf files. Also if you're lucky enough that they actually put the description fields in to the declarations, it will put that in the markdown also. Just knowing the module interfaces goes a long way in understanding what the modules do or can't do, what stuff is hard coded and what stuff you need to hunt for, e.g. are there a bunch of data terraform_remote_state resources pulling inputs in to the module instead of using variable declarations, etc.