It’s not the first time you felt stymied as a writer.
It happens. You’re looking at a sentence you wrote and thinking, “Do you put a comma before so?”
Is so a coordinating conjunction? Is it a subordinating conjunction? Is it an adverb?
The short answer is, “Sure. It can be any of those things.” But until you see when and how, knowing that doesn’t help much.
Once you know the rules described in this post, though, say goodbye to confusion.
You won’t miss it.