/var/www/html: directory from which content is served by
default.
/etc/nginx: directory that holds all of Nginx's
configuration.
/etc/nginx/nginx.conf: file that makes global Nginx
configuration changes.
/etc/nginx/sites-available: directory that holds per-site
server block configurations.
/etc/nginx/sites-enabled: directory that holds symbolic links
to certain server block configurations in
/etc/sites-available. Only those that are linked are enabled.
/etc/nginx/snippets: directory that holds configuration
snippets that can be used repeatedly in configurations.
/var/log/nginx/access.log: file that holds every request to
the server.
/var/log/nginx/error.log: file that holds every Nginx error.