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Challenge your unknowns
Learning new things sparks curiosity. The author's advice to students asking "what's next?" is twofold: be curious and expose yourself to an area you don't know (failing and restarting is how you learn), and play with assignments and cases you find on the web.
Some content is free, some paid. Set aside time and prepare — it will be time-consuming and at times frustrating. Don't worry, it will come.