Hi Sam,

Thank you for taking the time to comment! With all due respect, I stand by our writer’s choices in all three instances.

1. I agree that there is a level of redundancy in “sales job selling”, but the emphasis of Kathy’s point here is that he worked in sales. If she had written it as “a job selling software” I believe that emphasis would have been lost. She must have weighed up the redundancy with the emphasis and decided to keep in it. That said, perhaps we could have rewritten it to say “a software sales job.” So I’ll give you that one.
2. There does need to be a comma before which in this instance because it introduces a nonrestrictive phrase. There is more explanation here: https://www.youtube.com/watch?v=YLpvatowqh8
3. In this sentence, “favorites” is correct because Kathy is referring to one of multiple favorites, and so the word favorite is a noun. Had she written “one of my favorite copywriters”, then the word “favorite” is an adjective and so should not be pluralized.

I completely understand that you would have written it another way. That’s the beauty of the English language: there are infinite ways to express yourself.

Have a great day!

Lisa and the ProWritingAid Team.