Punctuation:

Punctuation: it can make or break your writing, especially if
you're missing a particular comma (the Oxford comma to be
exact). Check out this info graphic for a few fun facts and
examples on when to use the infamous Oxford comma. For example,
did you know that the PR department at Oxford University no
longer uses the comma, while the Oxford University Press
continues to include it in their writing to this day? Which side
of the argument are you on? http://bit.ly/1edRd6I