I have at long last purchased "The Elements of Style" by Strunk and White.
Now I have my commas in the right place. I think I have got the gist of
when a participial phrase at the beginning of a sentence must refer to a grammatical subject.
A small book, but a good one. Notice the comma before the conjunction introducing an independent clause.
I think I love grammar; although I'm not very good at it just yet. rule 5 Do not join independent clauses with a comma.