Hi all. I need to have some specific functionality to my Drupal 6.1 driven teaching/lessons website, I am developing.
I know basic PHP (I'm actively learning daily). I am reasonably versed in HTML/CSS/MySQL, oh and I have spent 6 weeks playing with Drupal and so I now understand the relationships between page, theme, block, module etc.
I just need to know, before I start allocating large chunks of time to learning how to code modules etc and the Drupal API, can I add my own MySQL tables to the database with relationships to the Drupal core tables, to extend functionality?