WHY I USE THE OXFORD (OR SERIAL) COMMA
After winning the Academy Award, Matthew McConaughey thanked his parents, Jennifer Garner, and Jared Leto.
After winning the Academy Award, Matthew McConaughey thanked his parents, Jennifer Garner and Jared Leto.
Without the comma we have a false appositive.
Mary was proud of her recipes for cupcakes: marzipan, almond and coconut and chocolate chip.
(Is it almond and coconut or is it coconut and chocolate chip or are all three combined?)
Book dedication: To my parents, Ayn Rand and God.
The writer is a demigod with an inherited tin ear for language?
Since you have to use it in some cases to prevent confusion, be consistent, and use it always.