Question about Microsoft Windows 10 Home

I downloaded Win 10 directly from Microsoft and then entered the purchased key. It worked without any problems.

Works. Without wanting to badmouth our local providers: I always installed Win 10 via stick (I have one that I need for about every PC) and bought the keys online for 15$. It's just about 80-85% cheaper... Despite the daily rate (79.- instead of 99.-). Why do I say that? I feel a bit cheated, if I have to pay 64.- for the CD...

You can also change the key later.

Windows 10 asks for a key during reinstallation. Can also be loaded from USB. Internet connection is advantageous, as updates and drivers for the hardware are searched for.