Now that you have Windows 10 operating system free download full version with key, you need to activate it. This can be done by purchasing a digital licence from Microsoft (https://www.microsoft.com/en-us/windows/get-windows-10) or by using a product key from a previous version of Windows. If you do not have a product key, you can try activating Windows 10 by phone (https://support.microsoft.com/en-us/help/10749/windows-10-activation).
Once you have activated Windows 10, you will need to personalise it. This can be done by going to the Start Menu and selecting "Settings." From here, you can change your background, personalise your lock screen, and change other settings to make Windows 10 feel like your own.
Now that you have Windows 10 installed and activated, you can start using it! Be sure to explore all of the new features that Windows 10 has to offer. And if you run into any problems, be sure to check out the Windows 10 support page (https://support.microsoft.com/en-us/windows).