Referencing is acknowledging other's work or idea that you have used in your assignment. There are many different referencing styles. Check your course outline or ask your lecturer which one you need to use and then refer to the referencing guide: https://guides.library.uq.edu.au/referencing
EndNote can be used to manage references, insert citations and generate lists of references. Trademark of Clarivate
Referencing is stating where you got your information from; i.e. - your sources.
You reference to avoid being accused of plagiarism.
See the following pages for more information:
Find out what is plagiarism and how to avoid it in your assignments