optimize your website

leverage browser caching nginx:

server {
    listen       80;
    server_name  localhost;

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
    }

    location ~*  \.(jpg|jpeg|png|gif|ico|css|js)$ {
        expires 365d;
    }

    location ~*  \.(pdf)$ {
        expires 30d;
    }
}

Thanks to: https://www.digitalocean.com/community/questions/leverage-browser-caching-for-nginx
Thanks to: https://varvy.com/
Thanks to: https://developers.google.com/speed/pagespeed/insights/