I was always taught that if you are listing things you never put a comma before 'and' (at the end). It seems logical to me, as you wouldn't write about 'fish, and chips' or 'bread, and butter'. The Oxford comma, of course, is totally the opposite. And that is the beauty (and frustration for those learning English!) of our language. 'Rules' contradict themselves and often more than one option is available, rather than being hard and fast. Debate, discussion and argument can be endless - and in a lot of cases 'both versions are considered acceptable'.
Whilst I do not normally use the Oxford comma, SG, I am, unfortunately, well versed in the Oxford coma. This is the state of mind that ensues when spending an hour or more attempting to exit the car park at the rear of the Kassam Stadium after yet another Argyle defeat...
Ah, the Oxford comma 😎. The most fun when you’re working with both British and American proof-readers. Many a debate (nay, argument) has been had in my company.