When I get some time I’ll try to change this into a series of blog posts, but for right now here’s a 141 page pdf file that covers the following in a step by step manner:

• Install and Oracle VirtualBox
• Create an Oracle Linux Server
• Install and Configure Oracle Grid Infrastructure for a Standalone Server (with special ‘Rich Soule’ start and stop scripts for using ACFS file systems)
• Install Oracle 12cR2
• Create a Multitenant Database
• Install and Configure Apache/Tomcat/ORDS
• Install and Configure Oracle Application Express

You can find the pdf here: Using the Oracle Cloud (or Oracle VirtualBox) to build a DBA practice environment.