Part 1:
The Oxford comma is controversial. I myself have fought vehemently with people many times over my love of the Oxford comma. Even if you decide not to use it (and I immediately disown you), you should know what it is. Court cases have been won and lost over it.
Part 2:
Definition: the Oxford comma is the comma that comes right before the last phrase at the end of any list. Example:
“Red, white, and blue.” Oxford comma
“Red, white and blue.” No Oxford comma
Part 4:
Both sides of the argument believe without question that their side makes sentences more understandable. For comma haters, “Red, white and blue” are understood to be three separate descriptors/items. For comma lovers, without the comma, they are clearly only two descriptors/items.
Part 5:
In a recent court case within the past few years, a court decided that the missing comma meant that workers could have over time pay. For more info on the case and the comma in general, see https://m.huffpost.com/us/entry/us_58cad41ae4b0ec9d29d9dd28
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