no
No, you do not always need to put a comma after the word "so" if it is the first word in a sentence. It depends on the context and flow of the sentence.
Yes, if it is the first word of the sentence.
It depends on the context and structure of the sentence.
Yes, you should capitalize the word after a comma in a sentence.
In most cases, the word "sit" does not need to be capitalized after a comma unless it is the start of a new sentence. The general rule is to capitalize the first word of a new sentence, regardless of whether it follows a comma.
No, there should not always be a comma after the word "hopefully." It depends on the sentence structure. When "hopefully" is at the beginning of a sentence, it is often followed by a comma, but if it is used within a sentence, a comma is not necessary.
No, a comma is not needed before and after the word "again" if it is in the middle of a sentence.
No, a comma is not typically used before the word "apparently" at the end of a sentence.
You can put a comma before or after just about any word if the sentence structure requires it. If the sentence structure does not require it, it may be permissable to use a comma to assist in clarity and avoid confusion. Otherwise, don't use a comma. Have I confused you yet? Using a comma does not depend on the word, it depends on the structure of the sentence.
Now, that would depend on the sentence as a whole. Now I'm going to bed.
Yes. Example: Unfortunately, I forgot to get milk while I was grocery shopping.
Say your sentence aloud. If you find you pause before the word 'therefore', you will probably want to insert a comma. If you do not pause, no comma is required. Use a comma when the sense requires it, not because you have a specific word in your sentence.