Port 443, 80, 8080, and 8443

I am developing a new site from the ground-up. Work is somewhat 30% complete. This is my first project so there are many things I need to learn.

One such thing is different port numbers. As far as I know I need to enable port 443 for securing data communication.

How it works and what are these ports?

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With Square the ports you’ll want to enable for traffic are:

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I’ve found some good resources on the internet.

Port 80 (HTTP) vs. Port 443 (HTTPS) - https://cheapsslweb.com/blog/port-80-http-vs-port-443-https-major-difference-to-know/

What is the use of port 8443? - https://stackoverflow.com/questions/61760786/what-is-the-use-of-port-8443