Here are some more of my reference sheets (one on plugins/tools development and one on security).
I think with that I cover all basic questions a new developer might have, except the system to install/upgrade a Dokeos install (changing SQL queries) and the way to actually query the database using the Database class. After that, some other sheet to explain how sessions work (and how to use them fully on the coding side) would be nice. This would make a set of 5 sheets that would explain almost all the intricacies of Dokeos… nice!
To avoid looking for the other post, here is a link to the first Quick Reference Guide.