MS licensing of Windows Server 2016 physics + Wirth, do I need to buy more?

Question

Microsoft

Comrades, the eternal question of licensing, which changes every time.
Right now, the current version is licensing for cores, i.e. the minimum order is the purchase of a pack of 2 * 8 licenses, i.e. 1 license is two cores and you need to buy 8 of them, even if you have less, but now the question is:
Can I use free licenses for another server or 1 server - 1 pack of licenses?
More:
I bought a mandatory pack 2 * 8 for a total of 16 cores, but I have a physical server with 12 cores. So I wanted to raise a virtual machine on a free Hyper-V Server there to create a virtual machine with 4 cores and install windows server 2016. Can I activate it with the same serial number because there are still free licenses in the package. Or 1 server 1 pack and when checking documents it may come up that you had to buy 1 more pack of 2 * 8 licenses.

Answer 1

what are they free if they already provide licensing?

Answer 2

The license physically covers the cores, so in principle, if you add a hypervisor to this machine, you can activate Windows inside under the same licenses. But on another machine it is no longer possible.

Answer 3

If you have a Standard license, then you can run:
1 Windows
instance 2 virtual instances of Windows Server
Datacenter - allows you to run an unlimited number of Windows instances inside the server. Effective when there are more than 7 VMs on the server