I once had someone ask me to please explain to him, for once and for all, what in the blazes this thing called an Oxford comma was. So, I did. But then I stumbled upon this nicely done video by Ted-Ed, and thought this was a much more thorough explanation.
As for me, I was taught to use a serial comma in college, and it’s become so natural that it gives me pause when I’m editing a project that doesn’t use it. (I do or don’t based on what an editing client desires.) How about you? Are you an Oxford comma subscriber?