Answer 1

Object Oriented Programming is a programming style that is intended to make thinking about programming closer to thinking about the real world.

In programming, objects are independent units, and each has its own identity, just as objects in the real world do.
https://www.sololearn.com/learn/CPlusPlus/1709/

I see you've just begun the tutorial, you should carry on with it and some of your questions will be answered by the course.