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Default Switch OS key =  R.CTRL + ALT + TAB

VirtualBox VM concepts

VirtualBox has host and guest OS support

Each VM runs a guest OS

VMs can be cloned to create new VMs or as backups to save state etc

VirtualBox is installed on a host OS

You install a guest OS in VirtualBox VM when needed

After installing a guest OS, install VirtualBox guest additions for that VM

This can provide additional features - networking redirects to the guest OS, common shared folders as drives between the guest and host OS and more

When to use a VM vs a container?

if you want to manage machines, you should use Vagrant. And if you want to build and run applications environments, you should use Docker. Vagrant is a tool for managing virtual machines. Docker is a tool for building and deploying applications by packaging them into lightweight containers

Do I need Vagrant to Manage VirtualBox VMs?

Maybe not. VirtualBox provides it's own UI as an admin console to manage VM instances created with VirtualBox

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