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Anyone can develop and distribute their own Terraform providers. (See Writing Custom Providers for more about provider development.) These third-party providers must be manually installed, since terraform init cannot automatically download them.

https://www.terraform.io/docs/configuration/providers.html#third-party-plugins

Vault doesn't store the data sent to the secrets engine.

The transit secrets engine handles cryptographic functions on data-in-transit. It can also be viewed as "cryptography as a service" or "encryption as a service". The transit secrets engine can also sign and verify data; generate hashes and HMACs of data; and act as a source of random bytes.

Reference link:- https://www.vaultproject.io/docs/secrets/transit

You can use required_version to ensure that a user deploying infrastructure is using Terraform 0.12 or greater, due to the vast number of changes that were introduced. As a result, many previously written configurations had to be converted or rewritten.

You can dynamically construct repeatable nested blocks like ingress using a special dynamic block type, which is supported inside resource, data, provider, and provisioner blocks

Reference links:-

https://learn.hashicorp.com/vault/day-one/monitor-replication

https://www.vaultproject.io/docs/internals/replication

The terraform validate command validates the configuration files in a directory, referring only to the configuration and not accessing any remote services such as remote state, provider APIs, etc.

Validate runs checks that verify whether a configuration is syntactically valid and internally consistent, regardless of any provided variables or existing state. It is thus primarily useful for general verification of reusable modules, including the correctness of attribute names and value types.

All backend system functions stored in the sys/ backend.

The system backend is a default backend in Vault that is mounted at the /sys endpoint. This endpoint cannot be disabled or moved, and is used to configure Vault and interact with many of Vault's internal features.

The Transit engine supports the versioning of keys. Key versions that are earlier than a key's specified min_decryption_version gets archived, and the rest of the key versions belong to the working set. This is a performance consideration to keep key loading fast, as well as a security consideration: by disallowing decryption of old versions of keys, found ciphertext corresponding to obsolete (but sensitive) data can not be decrypted by most users, but in an emergency, the min_decryption_version can be moved back to allow for legitimate decryption.

Reference link:- https://www.vaultproject.io/docs/secrets/transit

This endpoint returns high-quality random bytes of the specified length.

The terraform console command provides an interactive console for evaluating expressions.

https://www.terraform.io/docs/commands/console.html