Reinforcement Learning. The first AI programming I learned is Reinforcement Learning. It can learn different kinds of tasks just like humans do. The first book I read about this was written by Richard Sutton who was graduated in MIT. In the beginning,it was like you read a wordless heavenly book. Even you recognize every word,you still can't figure out the whole theory. But after I wrote a program by myself,and ran the program one line by one line. Suddenly, I realized everything and begin to interest in the AI field. This is first time I know how to transform bunch of numbers into robotic's thought.