There's more...

Take care when copying and pasting any configuration files. It's very easy to miss something and have one thing slightly different in your environment, which will cause issues with the website working as expected. Here's a quick lookup table of various other issues which you may come across:

Error

What to check

502 Bad Gateway

File ownership permissions for the PHP-FPM socket file

404 File Not Found

Check for the missing index index.php directive

403 Forbidden

Check for the correct path in the root directive and/or check for correct file permissions

Your error log (defaults to /var/log/nginx/error.log) will generally contain a lot more detail regarding the issue you're seeing compared with what's displayed in the browser. Make sure you check the error log if you receive any errors.