I am just getting started with Oracle XE and I am having trouble with the confusing collection of pdf documents that are available. What document(s) will show me the basic admin commands for SQL*Plus and SQL*Developer so that I can manage users and databases ? I am coming from Microsoft SQL Server so I don't understand the idea of apparently not having databases as the top level of the hierarchy. When I log in to Oracle XE I have a folder of tables at the top level.
I would like to be able to create and delete users and databases (schemas?) and understand the default users.
I would also like to understand the basic collection of tools. I keep seeing references to "Application Express" but I don't even know what that is, or what it is for.