There is no 'write' or wrong, anymore.
During my writing career I have learned a lot. I think 'the OXFORD comma' was one of my first lessons! The oxford comma: is a comma used after the penultimate item in a list of three or more items, before ‘and’ or ‘or’. I've come to the realization that every author has their own need and use of commas, and who is to say you are right or wrong!