(Remark: We don't recommend to learn abstract rules. Included in this website are audios book with the written text and translation. (In the parte literature.) We recommend to hear these audio books several times and to pay attention on how the words are pronounced. That way you can learn as well a lot about Brasilian history and in part why the Brasilian society is as it is today. Rules help to sensitize for the phenomenon. It is furthermore easier to learn some words and the corresponding pronunciation, this way you can easily deduce the rules, than learning the rules. This said, knowing the rules doesn't hurt. )