Which entry for subdomain CNAME for Github Pages

I want to set up an apex domain and www subdomain for Gitub-Pages. Setting up the apex Domain was easy. My DNS provider does not support ALIAS or ANAME records so I used the A record.

When i now configure a CNAME record with my DNS provider, what address should I use for a project page (not personal or organization page)?

YOUR-GITHUB-USERNAME.github.io

or

YOUR-GITHUB-USERNAME.github.io/YOUR-REPO

See point 3 = https://help.github.com/articles/setting-up-a-www-subdomain/

You always point your domains at YOUR-GITHUB-USERNAME.github.io when using a CNAME record. No /YOUR-REPO.

Also, don’t forget to create a file named CNAME to repository, which should contain Your (sub)domain name.

Perfect Thanks! So I create a CNAME with two URLs?

Example for CNAME

foo.com
www.foo.com

No, your CNAME file should only be www.foo.com. It’s actually preferred to use the Settings page for your repo to set your custom domain.