The academic and scientific world depends on people using the work of others for their own work. Dishonesty destroys the possibility of working together as colleagues. Faculty and researchers don't advance knowledge by passing off others' work as their own. Students don't learn by copying what they should think out on their own. The recommended penalty for plagiarism is failure for the course.
Unintentional plagiarism is still plagiarism.
Now that you have received this memo, you cannot plead ignorance. Therefore, if you have any questions about the proper acknowledgment of help, be sure to ask your instructor. Instructors in EGC 101 will not accept papers unless they are accompanied by all notes and drafts. When the assignment is to revise a paper handed in previously, you may not write on a new topic without prior permission from the instructor.