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“Something has gone seriously wrong,” dual-boot systems warn after Microsoft update
(arstechnica.com)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Don't use Virtualbox as it is a Hype 2 hypervisor not a hype 1. You want actually KVM via Libvirt. Libvirt also has the advantage of not requiring any proprietary software. (Just make sure to install the virtual drivers)
That's all fine and dandy but OP said they're not very technical. Conceptually Virtualbox is a lot simpler to deal with. There's a lot of advantages (philosophical and practical) to be had with a KVM or QEMU setup for sure, but if you want a simple to understand click-it-together setup then Virtualbox is better. If OP wants to graduate to a better setup then I hope they go for a good FOSS solution eventually but going straight for the deep end is rarely a good idea if you want people to understand what they're doing.
Virtual manager is pretty straight forward. You click on create and follow the wizard. You can even have VMs running in the background