The document discusses how to use Oracle data dictionary views to manage and retrieve metadata about database objects. It describes the structure of the data dictionary and various views like USER_OBJECTS, USER_TABLES, USER_TAB_COLUMNS, USER_CONSTRAINTS, USER_VIEWS, USER_SEQUENCES, and USER_SYNONYMS to obtain information about objects, tables, columns, constraints, views, sequences and synonyms respectively that a user has access to. It also discusses adding comments to tables and columns and viewing them through data dictionary comment views.