The best way to deepen your knowledge of a certain topic is to practice it. Play with it, take quizzes about it, just be 'into it'. And when you can win prizes, that's always a nice extra.
Now there is a PL/SQL Challenge. It's completely free, and you can win (e-)books and Amazon gift cards. But apart from that, it's a great way to test, deepen and maintain your PL/SQL skills.
Find the PL/SQL Challenge at http://www.plsqlchallenge.com/ .
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