Learning Oracle Day 1

Started learning Oracle with big data.

Getting enviroment set up, I am using my machine Centos 6.5
To save me a lot of hassle in installing all required packages for Oracle, I decided to use pre-installed vm from Oracle.
http://www.oracle.com/technetwork/community/developer-vm/index.html
I choose Big Data Lite vm.

Follow this link to install virtual box under Centos:
http://www.if-not-true-then-false.com/2010/install-virtualbox-with-yum-on-fedora-centos-red-hat-rhel/


For now I am using this link to get familiar with SQL:
http://www.w3schools.com/sql/
which has examples  for me to try in real time.