You can update Windows through the Settings app on your computer, although your PC probably downloads updates automatically.
To stop the “Your version of Windows 10 has reached end of service” notification, you can upgrade to Windows 11, edit the registry (set DiscontinueEOS to 1 ...
For users who aren’t ready-or able-to upgrade to Windows 11, there’s a way to stay protected for one more year: Windows 10 Extended Security Updates ...