This tutorial is made based upon my experiences.In DigitalOcean Firewall in Configured by default so no changes are needed.Let's Encrypt has been pre-installed for us in Digita Ocean, please see: http://do.co/le-nginx
sudo apt-get update
sudo apt-get install -y language-pack-en-base
sudo LC_ALL=en_US.UTF-8 add-apt-repository ppa:ondrej/php
sudo apt-get install zip unzip
sudo apt-get install -y php7.0 php7.0-fpm php7.0-mysql php7.0-zip php7.0-gd