give (someone) feedback on (something)
"Giving feedback" means telling the person who did something how good or bad it is. In the example above, the English learner is asking her tutor for help with a cover letter. The tutor is going to tell her how good or bad each part of the letter is.
Use the word "on" to indicate the topic of feedback:
He gave me some great feedback on the structure of the presentation.
Did you get any feedback on the new color?