When would you use PUT vs POST?
PUT is used to create or update a resource at the specified URL. POST is used to create a new resource without specifying a URL.
What is the difference between the "let" and "var" keywords?
Both "let" and "var" are used to define a variable, but they have scoping differences. "let" declares a variable that is local to block scope; whereas, "var" declares a variable that is local to block scope.
What is the difference between a <div> and a <span>?
The difference between these two tags is that a <span> is displayed in-line; whereas, a <div> is a block-level element. In other words, a <span> does not start on a new line, and it only takes up as much space as necessary. A <div> does start on a new line, and it takes up the full width available.