We have created a website, now we need to make this site visible to all
That my / your site was seen by everyone, you need to buy a domain and want a site (how I created the site, read here).
There we add two records of A (A - 126.96.36.199 A - 188.8.131.52) and one CNAME record (CNAME - username.github.io.) In my case is websitebuilderzero.github.io. Now we go to the github and create a CNAME file (name) and add the URL of your website (websitebuilderzero for example) to this URL file, then commit the file. Must looks like this (other entries are optional)