Answer 1

oop
object orientated programming
how objects interact and communicate with eachother.
like if u wanna make a robot
a robot has a body and arms and legs, grabbers
you can represent all of these as objects and you can create a robot object that has all of these as private members
mRobot.move()
might call the legs to go forward
mRobot.pickUpObject()
could call the move and grasp functions for the arms and hands.

oop
simply objects doing stuff together.
its like this for Every language
once u knkw It u know it.

hope this helps