VirtualBox is ridiculously simple to set up and get virtual machines going. Shared folders, shared clipboard and much more are no issue.
But.
It eats resources. The installed virtual machines (VM) run relatively slow. What have you found to be feature comparable - and most importantly more resource-efficient - alternatives for running VMs under Linux?
To be clear, I don’t recommend it. But it was once favored over KVM for a variety of applications and it works in a fundamentally different way. I’m just surprised how quickly it’s lost favor among techies.