"Por" vs. "Para"
Knowing when to use "por" and when to use "para" can be challenging! In general, both words can be substituted for the English word, "for", but not always.
"Por" usually implies that something is done in the name of something or someone, or that some sort of exchange is happening.
Use “por” to talk about:
going through or around an area
a reason for an action or justification
communication and transportation
exchange or substitution
provide a time frame for
"Para" usually implies that something is being done for something or someone. If it’s before a verb, it means "in order to...".
Use “para” to talk about:
a purpose or goal
the recipient of something
to be in the employ of
Unfortunately, there is no single rule for when to use either of these versatile prepositions; you just have to remember them!
Here are some lessons and articles that will give you some more information on all of the different uses of "por" and "para":