Before you plan the upgrade process, become familiar with the features of the new Oracle Database release.
Oracle Database New Features Guide is a good starting point for learning the differences between Oracle Database releases. Also, check specific guides in the Oracle Database documentation library to find information about new features for a certain component. For example, see Oracle Real Application Clusters Administration and Deployment Guide for changes in Oracle Real Application Clusters.
Oracle Database training classes are an excellent way to learn how to take full advantage of the features and functions available with Oracle Database. You can find more information here: