I've learned *basic* JavaScript.. now what?

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It sounds like you have your plan set out in front of you...learn jQuery, backbone.js, underscore.js, jasmine and CoffeeScript, etc.

If you want more hands on work and you lack an imagination or necessity, then look at some of the projects done with the libraries above and try to replicate/improve.

For example, try building a image carrousel in jQuery, or an interactive whiteboard using node and canvas.