Coursera has many excellent courses which I would recommend once you start diving into advanced applications. If your professors have a coffee-circle "Let's di

Coursera has many excellent courses which I would recommend once you start diving into advanced applications. If your professors have a coffee-circle "Let's discuss a research paper once a week" get-together, I'd highly recommend attending. Even if you don't get a paper completely, it's really nice to give other people a brief on what it's about, and you end up learning a lot of really great stuff. It's a good way to get up to speed. Not really online resources as you're looking for, but thought I should mention it.