Parallels is a money pit. When a new version of macOS comes out, parallels wants you to pay up, $49.95. Should you not pay up and skip parallels versions, you then you need to pay the full price. How do I know? I tried it.
Parallels is definitely easier to install macOS onto. You know how get the installation app? Down load macOS. when you get the prompt to pick a disk. go to the applications folder. Move the file somewhere else like downloads. quit the install app. Now, you have a copy of macOS. You startup parallels. You select create a new virtual machine. Parallels should find the macOS install app.
Parallels is a little confusing at first.

actions is where you will find how to reboot your machine. "Stop" is the "power off".

I tend to click on the "red" ball to put parallels in "suspend" mode.
It reads discs and flash drives with no problem.
R
Took me a long while to figure out how to do this stuff.
pss: You should definitely download parallels lite from the app store. I downloaded it today. There was no payment to download. Could be a required in app purchase.