Hey, thanks for your comment. There are no hard feelings and I really appreciate that. I'm not a native speaker but, I try to write and talk as correctly as possible.

I used to put commas before, however some grammar checking tools like grammarly marked them as wrong, and I changed my ways.

Comma rules are complex in both in my native language and English and a good, definitive guide would be really helpful.

Thanks for your comment again.