that would depend on if you have listed three or more nouns , pronouns before it. if it is exactly three, it doesn't matter.
last comma before the and is not necessary
No, typically you do not use a comma before the word "naming."
Yes, you should use a comma before "Jr." when writing a person's name to separate the person's last name from the suffix. For example, "John Smith, Jr."
No, typically a comma is not used before the word 'please' when it is the last word in a sentence. You can simply end the sentence with 'please' without a comma.
before
You can use ", and" or just "and" but not just a comma.
No, a comma is not necessary.
no
You would use a comma before it. Xerox, Inc.
If it is the last word in the sentence than yes you would use the comma. Commas are so you could take a little rest between words. Examples: I like cotton candy, too! Your at this park, too? I can't believe you did this to me, too! You gossip, too?
if the main or most important part is before the main parts you use a comma, but if it is after then no comma
Yes, you can put a comma before except. Example of a comma before except in a sentence- She can do it, except that the mountain is too steep