Berklee Music is probably the best regarded online music training school. I registered there a while back but simply haven’t been able to afford to do any of their amazing-looking courses (yet – I’m working on it). However the site is still extremely useful with lots of free resources.

For example, they have several excellent blogs with advice on music production, theory etc. I have embedded an example from Erik Hawkins’ blog, which focuses on using Reason and Pro-Tools (click this post’s title for the link).