Hello, @zuberanish

What is the exact error when you open the website? You can double-check if the webserver (Apache/Nginx) is running. You can also use the netstat command to check if any service is listening on port 80 and 443 as well.

netstat -tulpn | grep :80

or

netstat -tulpn | grep :443

I will also recommend you examine the Apache/Nginx error logs. If there is a problem with the webserver the error will be logged and you can then can easily resolve any issues.

https://www.digitalocean.com/community/tutorials/how-to-troubleshoot-common-apache-errors

And to check the Nginx error_log you can use the cat or less commands:

sudo cat /var/log/nginx/error.log

sudo less /var/log/nginx/error.log

Hope that this helps!
Regards,
Alex