Nginx virtual host config with SSL and Layer

example.com.conf

server {
        server_name www.example.com example.com;
        listen 80;
        return 301 https://www.example.com$request_uri;
}

server {
        server_name example.com;
        listen 443 ssl;
        return 301 https://www.$host$request_uri;
}

server {
    server_name www.example.com;
    root /root/of/example.com;

    include /etc/letsencrypt/options-ssl-nginx.conf;

    ssl_trusted_certificate /etc/letsencrypt/live/example.com/chain.pem;
    ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;
    ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
    ssl_dhparam /etc/nginx/ssl/example.com/dhparams.pem;

    listen 443 ssl;

    charset utf-8;
    access_log /var/log/nginx/example.com.log main;
    error_page 404              /404.html;
    error_page 500 502 503 504  /50x.html;

    location = /50x.html {
        root /usr/share/nginx/html;
    }


    try_files $uri $uri/ /index.php;
    location ~ \.php$ {
            fastcgi_pass   unix:/run/php-fpm/php-fpm.sock;
            fastcgi_index  index.php;
            include        fastcgi.conf;
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
    }
}