first of all answer to your question
what is an assignment operator ?
= is assignment operator
example :
var a = 10 ; // here i assign 10 to a variable, which means now a has value of 10,
so here = is assignment operator.
now from your code
you have assigned 87 to myVar using = which is assignment operator.
about your challenge
hint => you have to increase value of myvar using ++ operator
now try to solve your code by yourself and have question feel free to ask
Anything you put in quotation marks is a string. So with "myVar++" you’ve just written something in the code that is just literal text. Not code. You could have written "hello" and it would have the same effect, it’s not doing anything.