Windows 11 Home requires an Internet connection and a Microsoft account for the initial installation. All further versions of Windows 11 require an Internet connection to perform updates and to use some functions.
If you are not sure whether your device fits the system requirements, you can use the PC System Diagnostics app to check the compatibility. In both Windows 10 and Windows 10 S mode, Microsoft also offers a downloadable app that tests your system's compatibility with Windows 11 for you.
If Windows 10 version 2004 or newer is installed on your device and your system meets the minimum requirements, you can upgrade to Windows 11 for free.
Open the settings of your computer, under Update and security you can now perform the free upgrade to Windows 11.
1 Here you can find a list for supported Intel and AMD processors