By Microsoft themselves, you will receive no more security updates after Windows 10 dies. Alternatively, you could pay for an extension to your Windows 10 license, though it comes at a cost. The number doubles each year, up to year 3, before Windows 10 is entirely unsupported for those who paid for a license extension.
I don't use Windows, but when you go to your control panel, I think(?), it should either say if you can install Windows 11 or not. If not, then you can attempt to upgrade, for free, using the Windows 11 upgrade tool from Microsoft.
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