what is the best tutorial to learn about character controller scripting and its animation?
Unity Cookie (a branch of CG Cookie) makes good tutorials. Also, google is your friend. It may take time to sift through various tutorials but it shouldn’t take that long. YouTube is probably the best place to search for them, though, since most of the better results from the google search will refer to YouTube videos (though some refer to Vimeo stuff, as well).
But yeah, start with Unity Cookie, then go from there.