Exercise to code a min max tree to play tic tac toe

What's the best beginning to learn artificial inteligence?

I don´t know, but why not to try to emulate a very simple "inteligence", what I trying to do is... make a tic tac toe that can confront to the human that is playing using a data structure to hold all the repercutions of every choise it can do to select the one that looks better to do.