Illegal characters in source hostname part. 10

So why a got this error in cname record when i put cname record sorce as @?

You can’t setup a CNAME record for the root of the domain name. It’s not just that InfinityFree doesn’t support it: DNS in general does not support CNAME records at the root of a domain! The root of your domain name is always locked to your hosting account.

Hea but i want o root of domin to host on github pages

@Fun4TubeGr said:
Hea but i want o root of domin to host on github pages

If you want to host your website with GitHub pages, you could register a domain elsewhere and point it to GitHub. Domains on InfinityFree can only be used on InfinityFree hosting.