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?
Hello, Anon. Yes, the book's comment is unclear, but as the other posters have been trying to explain, a comma only between independent clauses creates a comma splice, but you should insert a comma if there is a coordinating conjunction but no comma. If there is no coordinating conjunction, then insert a semicolon or make 2 sentences with a period.
Quite easy! the role is simple.

First: if u have got AND , OR , BUT or SO, use comma for these conjunction.

However, other conjunction like MOREOVER, HOWEVER ...so on, u can use ; or . if u like
Students: We have free audio pronunciation exercises.
run-on is when there is no ponctuation at all

comma fault is when there is wrong punctuation

in first case you put some punctuation to separate

in the second case you put a word like and or but to separate
 Mister Micawber's reply was promoted to an answer.