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Expose my server to internet

Hello,

Out of curiosity, I just want to access my server over internet.
I have forwarded port 80.
I have got a free domain in NoIP.
In my router I've also configured the settings and successfully logged in.
But when I test whether my port 80 is accessible, it's not opened.
This is my home system, using Ubuntu 18.04. I've not enabled any firewall
by myself.

So just wanted to know whether should I configure anything in Apache httpd
to make port 80 accessible?

Thank you.