Para or por?

Question

The lesson doesn't seem to differentiate between these two words and the 2 quiz questions just require the same single word answer.  Is there anywhere that explains the differences in more detail please?

Inma Sánchez · Answer

Hola Dave,
As explained to Innocent in this same thread there is a link a the bottom of the lesson that takes you to a different lesson using "por" not para, with a different meaning. Here is the link. Have a look.
Using por (not para) to express the originating cause or reason 
Saludos
Inma

Josué Toriz · Answer

I wrote "a fin de" because it's another correct way to say in order to, actually it's a formal way. Ahora resulta que siendo hispanohablante no sé cómo hablar mi propio idioma y una app para angloparoantes me va a enseñar...