How to configure Nginx configuration file in ubuntu for localhost port forwarding

First

cd ..
cd etc/nginx/

This takes you to the root dir of the Nginx server
then

cd sites-available
vim YourSiteName

Now,

server {
        listen 3000 default_server;
        listen [::]:3000 default_server;

        root /var/www/html;
        index index.html index.htm index.nginx-debian.html;

        server_name _;

        location / {
                try_files $uri $uri/ =404;
        }
}

To save and exit from the vim use this command

:wq

Now, We want to update the sites-enabled dir

cd ..
cd sites-enabled/
vim YourSiteName

server {
        listen 3000 default_server;
        listen [::]:3000 default_server;

        root /var/www/html;
        index index.html index.htm index.nginx-debian.html;

        server_name _;

        location / {
                try_files $uri $uri/ =404;
        }
}

Now, Rur your project/application and forward the port.
In the given example the defeat port is 3000.

cd
cd yourProject 
npx http-server -p 3000

Check out more on in-depth guide through Nginx The Nginx is a reverse proxy that enables the user to host a static and dynamic website