There is a lot of publicly available free content created by oracle server technologies. This content is mostly in the form of Demo’s, OBE’s, Tutorials, Videos etc. A wide range of topics are covered including database, fusion middleware, java, enterprise manager etc, etc…
It is a great resource for learning new oracle topics.
You need a oracle technology network (otn) login to access this content.
The content can be accessed at http://oracle.com/oll
There is also a Oracle Learning You Tube Channel.