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I second Coursera. I read you want to become an audio engineer. I am in a music production course through Berkelee School of Music on Coursera.org.

You are getting great advice. Pick one thing and do it for 10 minutes.

There are a couple of digital music courses on Coursera, one that just ended (but is archived) and another coming up in October:

* Introduction to Programming for Digital Artists (https://www.coursera.org/course/chuck101) (yep, this is for music)