Question: How do I put more comments in my code so it allows the reader to navigate and understand my code quicker which will improve maintainability?

How do I put more comments in my code so it allows the reader to navigate and understand my code quicker which will improve maintainability? I am not sure where in my code I need to do that.
Why was var used to declare a variable, i leanrt that var is out of date. Can I use let instead?
 How do I put more comments in my code so it

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