I first read this piece years ago, I think it's really great advice.

Tl;dr is:

> When a writer asks you for feedback on their writing, what they really want is to know is:

> What’s going on in your head?

> What are you thinking?

> How do you feel?

> When you agree to give feedback on a piece of writing, your job is to notice what’s happening in your head and share it with the author.

> The best way to do this, in my opinion, is simple: leave notes on everything. In other words, try to give the writer your play-by-play reaction to every part of their piece.