When to use commas while writing in Polish?

When we consider writing a comma, it will usually be just before the conjunctions.
We DON't use commas before: i, oraz, tudzież, lub, albo, bądź, czy, ani, ni. Also when 'a' is used as an equivalent of 'i' - EXAMPLE There is no difference between this room and the other one. Nie ma żadnej różnicy między tym pokojem a tamtym innym.
REMEMBER - In Polish there are no Oxford commas - we use commas when we name a few things in the order but before and we will never put comma. EXAMPLE: I saw Joanna, Julia, and Mateusz. Widziałam Joannę, Julię i Mateusza.