Explanation
A workspace can only be configured to a single VCS repo, however, multiple workspaces can use the same
repo.
https://www.terraform.io/docs/cloud/workspaces/vcs.html

Explanation
The terraform init command is used to initialize a working directory containing Terraform configuration files.
This is the first command that should be run after writing a new Terraform configuration or cloning an existing
one from version control. It is safe to run this command multiple times.
This command is always safe to run multiple times, to bring the working directory up to date with changes in
the configuration. Though subsequent runs may give errors, this command will never delete your existing
configuration or state.
terraform init command does -
* Copy a Source Module
* Backend Initialization
* Child Module Installation
* Plugin Installation
https://www.terraform.io/docs/commands/init.html

Explanation
Terraform Cloud always encrypts state at rest and protects it with TLS in transit. Terraform Cloud also knows
the identity of the user requesting state and maintains a history of state changes. This can be used to control
access and track activity. Terraform Enterprise also supports detailed audit logging.
https://www.terraform.io/docs/state/sensitive-data.html#recommendations