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Hi,
I like to look at the website source called "Get It Write" for its excellent writing tips. Can you tell me why quotation marks are used for words here on its writing tip on the use of a comma before "And"?

Writing Tip: February 2, 2004
When to Use a Comma before "And"
Two specific situations call for the use of a comma before "and." The first is created when we have three or more items in a series. This mark of punctuation is called the serial comma. For a full explanation of why we use the serial comma, please read our previous tip on the subject. (See "Serial Comma" on p. 49 in our book of writing tips or find the link to the "Serial Comma" tip in our online tip archive.)
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Because they are writing about the word itself, not using it as a conjunction.
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Students: Are you brave enough to let our tutors analyse your pronunciation?
Thank you. What would be the reason for quotation marks in two places here (from the same previously posted paragraph)?

(See "Serial Comma" on p. 49 in our book of writing tips or find the link to the "Serial Comma" tip in our online tip archive.)
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They a section title.
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