Por/Para Uses

• in order to/to: para
• for (comparison/"for her age"): para
• work for a place/company/boss: para
• time (deadline, due date, by): para
• place/verb of motion/final destination (headed for): para
• gift or recipient of something: para
• exchange (I paid $20 for the shirt): por
• because of, motivation, explanation (porque): por
• work for or instead of someone, substitution: por
• time duration (i did this for 5 minutes): por
• place/verb of motion; through, by along (drive "through" the city): por
• transportation (by train, plane): por