Por is used when you are referring to motion like by or a period of time and para is for talking about the destination like in order TO or about TO.
Example: Para sacar buenas notas. To get good grades.
La galleta es por tú. The cookie is for you.
Hope this helps
Example: Para sacar buenas notas. To get good grades.
La galleta es por tú. The cookie is for you.
Hope this helps