I understand the principle but I dont get it at all

Tell us what’s happening:
Describe your issue in detail here.
I did my code as I have learned so far. To me it seems right but the code isn’t running as I coded it. can someone tell me what I am doing wrong?

Your code so far

// Variable declarations
var studlyCapVar = 10;
var properCamelCase = "I am ";
var titleCaseOver = 0;

// Variable assignments
studlyCapVar = studlyCapVar + 0;
properCamelCase = properCamelCase + "A String";
titleCaseOver = titleCaseOver + 9000;

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Challenge: Understanding Case Sensitivity in Variables

Link to the challenge:

You should only declare the variables up top, then assign them below.

Reset the step, what you had to do was fix the variable names, not the variables that are assigned to them