Michael Leddy offers helpful advice in the use of the comma, the semi-colon, and the colon.
Rule one
If your sentence begins with an introductory element, put a comma after it. Even if it’s a short element, put a comma after it. In time, you’ll be putting this comma in without having to think about it.
Read the rest …here…
I need to read and absorb the whole site. He offers some very clear assistance on basic writing, assistance I need to come to grips with.