Window key license when ESXi installing

Hi I am trying to install ESXi in PC. I have some issues. I hope expert to give some points. Thank  you
1.  Windows10 key license: the Windows10 is now installed in the PC. I want to transfer the license from current PC windows10 to the guest Windows10 after I format the PC and install WIndows10 on the ESXi. I contacted the PC vendor. He said i can connect to internet and then directly activate it after I install guest WIndow10. Is this right way?
2. I am going to install ESXi and then Windows 10 on it. All of these is for personal lab use and it is not for production. Where can I can buy it in low price? Can I copy the guest Windows10 without second new license?
eemoonAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
1. Where is the License Key ? Did you get Windows 10 with the hardware, e.g. this is called OEM, and if it's OEM you may not be able to transfer the OEM Product Key.

or, is your License Key retail ? e.g. you purchase a Windows 10 box?

But I would not bother, re-format your PC, install ESXi, and then download and install the Evaluation version below, and it will all work free for 90 days.

2. You may be able to obtain a Windows 10 evaluation license and software.

This download is a FREE, 90 day evaluation version

https://www.microsoft.com/en-us/windowsforbusiness/try
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eemoonAuthor Commented:
Thank you so much for your fast reply. I bought PC, which was preinstalled with Windows10. So that key license is inside the PC. I cannot see it.  And I just want to make lab.  if it does not work, that is also fine.

Sorry I did not express myself clearly. I mean, all ESXi on sale for production is expensive. and the price is so different and various in different stores. I wonder if there is cheap ESXi for us to make lab at home? 
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Thank you so much for your fast reply. I bought PC, which was preinstalled with Windows10. So that key license is inside the PC. I cannot see it.  And I just want to make lab.  if it does not work, that is also fine.

Sounds like it's OEM, you may not be able to use it.

Yes, ESXi is FREE! if you register it at VMware you get a free license!

otherwise you can evaluate for 60 days without a license!

Here are two EE Articles I wrote to help you, and have the links to download for FREE and register

Part 1:  HOW TO: Install and Configure VMware vSphere Hypervisor 6.5 (ESXi 6.5)

Part 2: HOW TO: Connect to the VMware vSphere Hypervisor 6.5 (ESXi 6.5) using the vSphere (HTML5 Web) Host Client 6.5
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eemoonAuthor Commented:
Yes, ESXi is FREE! if you register it at VMware you get a free license!

Is this free FOREVER?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes.
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eemoonAuthor Commented:
Thank you!
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