The one I'm using when needed is VM VirtualBox www.virtualbox.org

On first start it looks complicated but it's not that hard you don't need to understand every option. It's just a computer inside of a computer and you ficede what main computer shares with that virtual computer :)

Youtube is your friend in learning the basics. Network Chuck is pretty good in explaining stuff. And also LLMs also knows a lot and can be your personal tutor in this case.