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Where to "practice Linux" terminal commands
(lemdro.id)
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I think you might like DIstroSea. If you'd like to persist your experiments, then likely learning how to emulate systems with QEMU or VirtualBox (the latter if you'd like a friendlier GUI-led experience, the former if you want to go full-CLI virtualization). QEMU is great in how lightweight and easy to create and discard self-contained VM disk images can be.
I will repeat it once again... Why would you use subpar Type 2 virtualization and DKMS with VirtualBox when there's a perfectly viable UI for the kernel's built-in Type 1 hypervisor (Qemu being the userland): https://virt-manager.org/
I'm not the biggest fan of VBox either, it's just very popular and full of sequential "wizards" to guide the user along the process of creating VMs, so it might be one way to get started. I'd much rather work with QEMU though.
Virt-manager is a complete full UI for Qemu (and lxc and Xen) which works essentially the same way. It's been around since 2009.