These links have been sitting in my bookmarks for months now. There's a lot of tutorials, documentation, and free books. Many are resources that I still reference regularly, especially when developing a new feature or app, or whenever I run into a problem.
I use Backbone on a daily basis and love it. It certainly has it's problems; mostly that it's so un-opinionated you'll spend a lot of time just deciding on the "best" way to handle something. But it is amazingly flexible while still providing excellent structure, especially when combined with Marionette.
Having been introduced to Grunt and RequireJS, it's hard to imagine starting another project without them.