official source for Oracle internals

 Hi list, 
Which is the official source for Oracle Internals, Metalink, SYS schema try
and test, Oracle University, experts, Tom Kyte, google.
If one day someone decide to learn them and update, which is the first place
he should go.

Thanks in Advance
 
Juan Carlos Reyes Pacheco
OCP
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http://www.freelists.org/webpage/oracle-l

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