How To Install Linux, Apache, MySQL, PHP (LAMP) stack on Ubuntu
https://www.digitalocean.com/community/tutorials/how-to-install-linux-apache-mysql-php-lamp-stack-on-ubuntu

How To Set Up Apache Virtual Hosts on Ubuntu 12.04 LTS
https://www.digitalocean.com/community/tutorials/how-to-set-up-apache-virtual-hosts-on-ubuntu-12-04-lts

How To Create a SSL Certificate on Apache for Ubuntu 12.04
https://www.digitalocean.com/community/tutorials/how-to-create-a-ssl-certificate-on-apache-for-ubuntu-12-04

How To Set Up Multiple SSL Certificates on One IP with Apache on Ubuntu 12.04
https://www.digitalocean.com/community/articles/how-to-set-up-multiple-ssl-certifi

How To Set Up SSH Keys
https://www.digitalocean.com/community/tutorials/how-to-set-up-ssh-keys–2