I have been reading the book "Write Right! and can't understand the following advice about the use of commas. The following two passages seem contradictory to me. Any assistance would be appreciated!
"A run-on...is two independent clauses that are not separated by punctuation or a conjunction. To correct the error, provide the separation by adding a period, semicolon, or comma."
But then the books says
"A comma fault is two independent clauses connected only by a comma..."
Isn't adding a comma between two independent clauses one of the methods just given for fixing a run-on sentence?