nixCraft published a guide about installing Nginx on Ubuntu 20.04 LTS.
How to install Nginx on Ubuntu 20.04 LTS - nixCraft
This guide explains how to install an Nginx webserver on Ubuntu 20.04 LTS Linux and open required TCP port 80 and 443 using ufw and virtual host config.
How to install Nginx on Ubuntu 20.04 LTS - nixCraft