Simple beginner question about default tables (LOGMNR, etc.)

Hi all, I just installed SQL Developer and the Express server. I have worked with other SQL databases and with remote Oracle databases. But never been a DBA for an Oracle DB. I tried searching on LOGMNR and AQ$_, but couldn't find anything, hence this question.
If there is some online documentation that covers these particular tables and my question, then a pointer to that would be appreciated.
Anyway, I created a connection per the instructions and it seemed to work. But when I look at tables listview, I see a whole slew of tables. I assume these are all housekeeping/meta data tables (eg. information_schema in MySQL). Is this correct?
Also, short of manually creating a filter for each of the file types ("%$%"help", "LOGMNR%", "SQLPLUS%", etc.), is there an easy way to ignore these tables and just see the tables I want to create for testing purposes?
And I am curios why these all show up by default. Could it be that I am expecting something because of experience with other databases and am actually doing things the "wrong" way? Or is this just because I am using the Express Server? Or is there another (very good) reason for these tables to exist?
Thanks,
justme

The complete oracle documentation is at http://tahiti.oracle.com. There is a lot of it, but Log Miner and Advanced Queuing have their own manuals. You should also consider starting with the Concepts Manual followed by one of the "2-day" tutorials such as "2-Day DBA"
What user are you connecting as? It sounds as if you are connecting as SYS or SYSTEM if you can see the dictionary tables.
You should create a separate user to connect as.
(create user myuser identified by mypassword;
grant connect,resource to myuser;)

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