Action Script

Flash comes with an action script editor there are 2 types as3 and as2. The script is meant to make it easier to add functionality to your flash I’m no expert but am able to read and follow other peoples leads in this area for anyone who wants to know more here is a link to Adobes Action Script 3.0 Language and Components Reference there’s a lot in there all the info is to the left.
I will add more as I journey along but for now this is a good start.
ActionScript 3.0
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This site looks pretty comprehensive it has categories from begginer
to advanced and even an archived category
actionscript.org