I like small books that build progressively more complex projects (Dave Thomas's Elixir book was good that way, Realm of Racket was my favorite). Short video tutorials are nice as a supplement are nice, too. Daily Drip's elm videos were fantastic.

The #1 thing I'm usually looking for is something that eliminates any time-wasting hassles related to getting set up, and all the major language features in some set of working examples.

After that, I usually write little command line apps, play with graphics a bit and convert some simple games into the language.