know any good readings explaining what arrays do and how to use them
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Have you tried the tutorial: Arrays for Beginners
Everything you need to know about the array object
Basically an array is a 1, 2, or 3 dimensional grid of cels each containing a value,string,or both!
They can be used for storing save data (although a dictionary is better there), or inventories, or even tile-based level editors. Be creative! I've even used them for screen transitions.
I find the best way to learn how to use different objects is to look at the conditions, triggers, and actions then experiment.
A little video tute