Address
Separation letter from letter and number from number in addresses if addresses for making new lines =commas
Listing
Separating words, phrase, clauses that are listed out.
Dates
Seperate letter from letter and number from number in dates from the sentence it starts
Interjection
commas go around unless exclamation point is used.
Between equal adjectives
Separate adjectives that describe same noun equally if their order can be swapped and it still makes sense commas need to seperate them