However, writing directly to /etc/nginx/nginx.conf is not a good idea because if we upgrade NGINX, the nginx.conf file may get replaced. Also, if the server has to handle many services, the large number of server blocks in the file will make it hard to read and maintain. Therefore, it's good practice to split configurations for different services into different files from the outset.
A common convention is to use two directories: /etc/nginx/sites-available and /etc/nginx/sites-enabled. You'd place the configuration for each service as separate files under the sites-available directory. Then, to enable a service, you'd create a symbolic link from the sites-enabled directory to a file in the sites-available ...
