2.This is call declaring a name, we assign the value “kim” to the variable name firstName.
let firstName = "Kim"
if console.log, the value should appear in the browser console.
3.Conventions and rules in JS.
JS doesn’t accept just any names of variables, we can use next format of variables name
Is prohibited in JS variables to start with a number
An error will show the row number where is happening and the name of it, this error is Syntax Error.