Hello,
If you have already had a Windows computer, check the Activation troubleshooter that is located on the Activation page. Once the troubleshooter completes running, select "I changed hardware on this device recently". Sign into your Microsoft account and see if you have any licenses available for you to use.
If not, you will have to purchase a Windows 11 Home (or Pro) license to activate Windows.
I hope this information helps. If you have any questions, please do not hesitate to ask!