I think I’m good with my commas. It just seems intuitive to me. Punctuation errors have a close relationship to imprecision of thought, but people are not given permission to use their common sense when they are taught grammar and punctuation. There is also, as the article points out, a relationship with voicing a sentence internally while you are writing it. Notice your pauses. Here’s a rundown of how to think about some comma decisions. (Ben Yagoda, NYTimes)