im lost, confused !

im so lost and confused ><
th first lecture:microeconomics .
i tot i understand alr .
but when i was doing th tutorial question
i felt lost ! D:
wat th heck is PPF ! F5F5F5!!!
=.=" i know wat th heck is PPF .
i just dont understand th stupid GRAPH!
and th tutorial question want me draw D:
how how how ! felt so sad now ><"

how am i going to survive through this?
ahhhhhhhhhh!
first week only, and im liddat!
`` comeon JOANNE! focus during lesson! -.-
FOCUSSSS