My understanding of universal IP address is that we are able to pin-point a particular PC. So can a people from all over the world enter in my IP address and then view the HTML page that my computer will serve them? If so, how?
Unknown. Your home router is what had the public IP address. That is what allows multiple devices in your home to have internet access simultaneously.
IF you have a public IP address, and you will have to verify that, then you would have to use a dynamic domain name service (DDNS) to associate a name with your public IP address.
You also have to allow standard webserver data ports through your firewall. THAT is a very dangerous thing. Bots are always trying to find webservers that are not...