EXPERT RESPONSE
The best place to look is at the Oracle documentation. The Reference Guide for your specific version lists all of the Data Dictionary views along with descriptions of each view's columns.
The Data Dictionary views for Oracle 10g are found in this Reference Guide.
All views that start with USER_ let the user see information about their objects. For instance, USER_TABLES shows their tables. The views that start with ALL_ show the user's objects they own and objects they have access to. The views that start with DBA_ show all objects in the database; as such, you need DBA privileges to see these views.
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