C++ Programming for the Absolute Beginner

Hello everyone!
So i started reading this book it is called ,,C++ Programming for the Absolute Beginner, Second Edition" by Mark Lee and Dirk Henkemans.I am now in in the 3 chapter.I decided to to some practice from this book.There it is called challenges as soon as I came to chapter 1 No.5 challednge i was confused and stuck because in this challenge there is a hint to use NESTED IF STATEMENT.But the problem is that in chapter one there no explanation how to use this thing. Anyone can explain me why the if statement is explained only in chapter 3?
Thanks in advence.
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