I have watched and learned from Chris Bray and Jared Polin. They are opposites in personality and style, but I get a lot of tips from them both. Chris Bray has an online lesson...I think there are 5 and free. And Jared Polin has a bunch depending on what you want so you can type his name and the topic.

Another go to for me is Digital Photography School - free - online.

Hope this helps :)