Not necessarily. Commas are a feature of sentence structure. There is no word or phrase in English that requires one.
NO YOU DON'T PUT COMMA IN THE WORD THAT BECAUSE IT HAS A QUESTION MARK IN IT,AND THAT QUESTION MARK REPRESENT IT'S OWN FUNCTION.
Yes, and here is a good example.
Yes, in a formal letter or email, the comma is placed after the word "sincerely" before your name. For example: Sincerely, [Your Name].
after it... ~but,~
Yes, a comma should come after personally. Example: Personally, I find this website very helpful.
Example: Someone asks "Are you a Cristian?" You answer "I am, though not hard core."
When you are listing things, for example- "I need Milk, Sugar and, bread."
When you park in front of a meter, put quarters in it. Otherwise, you may find you have a ticket when you return. This example uses the word otherwise and a comma correctly.
Certainly, I can add a comma after the word "said," as requested.
You can but do not have to.It is not wrong if you do.It is very rare to put a comma(This is what a comma looks like',')after a coordinating conjuntion.
no
Generally, the comma should be placed before the word "otherwise" when used to introduce an alternative or contrast. For example: "I need to leave now, otherwise I will be late."