Por and Para

Question 1

What are the uses of por?

Answer 1

Reason/cause
In place of 
Something done BY someone
Opinion
Personal implication
Through or via something
Per (eg. 3 times per week)

Question 2

What are the uses of para?

Answer 2

Finality
Although (for such a small bank, it has a lot of clients)
Personal implication
Destination, movement
Specific or limited time
Reason or cause
Opinion