introduction to drupal

I just caught part of the July meeting and was wondering if there might be someone to help a beginner with basic questions about content posting, theming, and security. It looked like a great group, but perhaps beyond my skill set at the moment, though I would like to observe if possible. I have a test site under development, have read the basic Drupal 7 books, and am able to import and update modules, but would like some tutoring on the above mentioned issues. I would be happy to trade whatever would be useful for the tutoring. Thanks.