How to Change Default Port Number of Nginx 1.17.0 on CentOS 7.6

This video covers the method to change the default Port Number of Nginx 1.17.0 on CentOS 7.6. Nginx is a web server which can also be used as a reverse proxy, load balancer, mail proxy, and HTTP cache.
For more explanation on this video: https://www.linuxhelp.com/how-to-change-the-default-port-number-of-nginx-on-centos-7-6