Thank you very much for the answer. I actually do not understand the differences in lastNamelength, lastName and lastName.length and also lastNamelength = lastName.length.
the wording of this can be tricky; but in a few days/weeks it will click
var howManyLettersAreInVariableA = 0; // this is a number.
var A = "NAME";
howManyLettersAreInVariableA = A.length ; //this is still a number, taking NAME and counting the number of letters