I have found that I try to use the old sandwich technique for feedback. I want to tell the student what they did well, what they did okay that needs improving or what needs to be prsent in the assignment next time, followed by some positive and encouraging summary feedback. I always provide feedback in a timely manner so the student has the information before their next assignment is due. I also try to provide resources for areas that need improvement such as avoiding plagiarism. I am curious to know what other techniques you may use when giving feedback.