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I think it's probably better that you have no YUI2 experience; the transition from 2 to 3 is a radical one that can be hard to get used to.

You can get a rundown on all the events a particular component publishes by checking out the API documentation for the component. Widget, for example, defines "init", "destroy", "contentUpdate", and "render" events.

Also, any component that makes use of the Attribute utility will fire events whenever one of their attributes change. These events take the form of "attributeNameChange", where "attributeName" is the name of the attribute that is changing. For example, if a component has an attribute "width", it would fire the event "widthChange" any time you called myComponent.set('width', someNewWidth)

The documentation isn't perfect, but that should get you started for the common use cases. Also, check out the user guides and example code. Good luck!

I did a little poking around, and it doesn't appear that the DataTable widget actively tracks the selected state of the elements within it. Depending on how complex your specific needs are, it might be easy to implement a plugin that would bootstrap this functionality onto the class, though.