ok.

as example https://elpis.ws and http://elpis.ws

the same as https://elpis.w10.site/ http://elpis.w10.site/

also .w0.am, .narod.ws and .oldcities.org

You can use both HTTP and HTTPS.

no settings were used

The NET::ERR_CERT_COMMON_NAME_INVALID error indicates a problem with a website's SSL/TLS certificate, specifically a mismatch between the domain name in the certificate and the domain name being accessed. This means the browser cannot verify the website's identity, leading to a security warning.