Resource for learning more about variables and SL
I want to learn/know more about variables and SL. I've looked at all the tutorials on the topic and have a very basic understanding of them, but I'd really like to understand the logic behind them rather than copy what someone else has created.
Does anyone know a good printed (and illustrated) refernce or source on the topic of variables and SL? I've started viewing the videos on YouTube on the topic. What about Screenrs other than those on the SL website?