These are some of the resources that will be very useful during your learning of the Spanish language.
Por que can be the union of the preposition por and the pronoun que.
Porque is a conjuntion (causal).
It could express a purpose too. In this case it requieres the verb in subjuntive.
Porqué is a name, synonymous for cause.
(His behaviour should have a reason. )
Por qué is used to make questions, when we are asking for the reason of something.
(Preguntó: ¿Por qué estás llorando? : He asked me why I was crying)