The default Linux distro used in Chrome OS Crostini is Debian. You are not stuck with it, though. Here’s how to change it to run Ubuntu instead.
If you are using multiple LXD containers on the same system, it makes sense to limit the amount of resources each component can use. Here’s how you can do so.
Containers are portable and easy to clone and/or move to other operating systems. LXD is a container that is designed to contain an entire operating system instead of an application.