Keep reading. Keep practicing (make something with what you learned). You can read all resources available, but your mastery comes from actual hands-on practice.
define domain of interest (eg. data mining, life sciences, machine learning, statistics, etc.), quizzes, quizzes, quizzes, books for advanced Learners, and check Coursera
Think in problems that you have and how you could create a program to it.
Example: Create a program that sum your note on school or create a game that like a quiz.
